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Finding the Fourth Proportional to 78,490.64, 108,340.80 and 53,354.72

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Solution

The fourth proportional to 78,490.64, 108,340.80 and 53,354.72 is: 73,645.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,490.64 : 108,340.80 = 53,354.72 : x
  2. Step 2: Convert to fraction form
    78,490.64/108,340.80 = 53,354.72/x
  3. Step 3: Cross multiply
    78,490.64x = 108,340.80 × 53,354.72
  4. Step 4: Simplify right side
    78,490.64x = 5,780,493,048.58
  5. Step 5: Solve for x
    x = 5,780,493,048.58/78,490.64
  6. Step 6: Final answer
    x = 73,645.64

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