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Finding the Fourth Proportional to 13,869.87, 20,815.71 and 6,470.52

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Solution

The fourth proportional to 13,869.87, 20,815.71 and 6,470.52 is: 9,710.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,869.87 : 20,815.71 = 6,470.52 : x
  2. Step 2: Convert to fraction form
    13,869.87/20,815.71 = 6,470.52/x
  3. Step 3: Cross multiply
    13,869.87x = 20,815.71 × 6,470.52
  4. Step 4: Simplify right side
    13,869.87x = 134,688,467.87
  5. Step 5: Solve for x
    x = 134,688,467.87/13,869.87
  6. Step 6: Final answer
    x = 9,710.87

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