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Finding the Fourth Proportional to 13,938.20, 20,907.18 and 3,549.92

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Solution

The fourth proportional to 13,938.20, 20,907.18 and 3,549.92 is: 5,324.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,938.20 : 20,907.18 = 3,549.92 : x
  2. Step 2: Convert to fraction form
    13,938.20/20,907.18 = 3,549.92/x
  3. Step 3: Cross multiply
    13,938.20x = 20,907.18 × 3,549.92
  4. Step 4: Simplify right side
    13,938.20x = 74,218,816.43
  5. Step 5: Solve for x
    x = 74,218,816.43/13,938.20
  6. Step 6: Final answer
    x = 5,324.85

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