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Finding the Fourth Proportional to 76,153.47, 105,147.23 and 61,128.78

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Solution

The fourth proportional to 76,153.47, 105,147.23 and 61,128.78 is: 84,402.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,153.47 : 105,147.23 = 61,128.78 : x
  2. Step 2: Convert to fraction form
    76,153.47/105,147.23 = 61,128.78/x
  3. Step 3: Cross multiply
    76,153.47x = 105,147.23 × 61,128.78
  4. Step 4: Simplify right side
    76,153.47x = 6,427,521,584.64
  5. Step 5: Solve for x
    x = 6,427,521,584.64/76,153.47
  6. Step 6: Final answer
    x = 84,402.22

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