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Finding the Fourth Proportional to 607,999.80, 911,999.70 and 408,934.20

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Solution

The fourth proportional to 607,999.80, 911,999.70 and 408,934.20 is: 613,401.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    607,999.80 : 911,999.70 = 408,934.20 : x
  2. Step 2: Convert to fraction form
    607,999.80/911,999.70 = 408,934.20/x
  3. Step 3: Cross multiply
    607,999.80x = 911,999.70 × 408,934.20
  4. Step 4: Simplify right side
    607,999.80x = 372,947,867,719.74
  5. Step 5: Solve for x
    x = 372,947,867,719.74/607,999.80
  6. Step 6: Final answer
    x = 613,401.30

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