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Finding the Fourth Proportional to 78,230.72, 107,958.11 and 42,420.64

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Solution

The fourth proportional to 78,230.72, 107,958.11 and 42,420.64 is: 58,540.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,230.72 : 107,958.11 = 42,420.64 : x
  2. Step 2: Convert to fraction form
    78,230.72/107,958.11 = 42,420.64/x
  3. Step 3: Cross multiply
    78,230.72x = 107,958.11 × 42,420.64
  4. Step 4: Simplify right side
    78,230.72x = 4,579,652,119.39
  5. Step 5: Solve for x
    x = 4,579,652,119.39/78,230.72
  6. Step 6: Final answer
    x = 58,540.33

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