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Finding the Fourth Proportional to 978,911.20, 1,468,366.80 and 680,312.80

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Solution

The fourth proportional to 978,911.20, 1,468,366.80 and 680,312.80 is: 1,020,469.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,911.20 : 1,468,366.80 = 680,312.80 : x
  2. Step 2: Convert to fraction form
    978,911.20/1,468,366.80 = 680,312.80/x
  3. Step 3: Cross multiply
    978,911.20x = 1,468,366.80 × 680,312.80
  4. Step 4: Simplify right side
    978,911.20x = 998,948,729,135.04
  5. Step 5: Solve for x
    x = 998,948,729,135.04/978,911.20
  6. Step 6: Final answer
    x = 1,020,469.20

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