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Finding the Fourth Proportional to 386,732.80, 580,099.20 and 209,585.80

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Solution

The fourth proportional to 386,732.80, 580,099.20 and 209,585.80 is: 314,378.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,732.80 : 580,099.20 = 209,585.80 : x
  2. Step 2: Convert to fraction form
    386,732.80/580,099.20 = 209,585.80/x
  3. Step 3: Cross multiply
    386,732.80x = 580,099.20 × 209,585.80
  4. Step 4: Simplify right side
    386,732.80x = 121,580,554,911.36
  5. Step 5: Solve for x
    x = 121,580,554,911.36/386,732.80
  6. Step 6: Final answer
    x = 314,378.70

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