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Finding the Fourth Proportional to 40,478.55, 60,721.88 and 12,398.28

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Solution

The fourth proportional to 40,478.55, 60,721.88 and 12,398.28 is: 18,598.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,478.55 : 60,721.88 = 12,398.28 : x
  2. Step 2: Convert to fraction form
    40,478.55/60,721.88 = 12,398.28/x
  3. Step 3: Cross multiply
    40,478.55x = 60,721.88 × 12,398.28
  4. Step 4: Simplify right side
    40,478.55x = 752,846,957.10
  5. Step 5: Solve for x
    x = 752,846,957.10/40,478.55
  6. Step 6: Final answer
    x = 18,598.66

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