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Finding the Fourth Proportional to 85,578.78, 128,398.58 and 38,189.57

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Solution

The fourth proportional to 85,578.78, 128,398.58 and 38,189.57 is: 57,297.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,578.78 : 128,398.58 = 38,189.57 : x
  2. Step 2: Convert to fraction form
    85,578.78/128,398.58 = 38,189.57/x
  3. Step 3: Cross multiply
    85,578.78x = 128,398.58 × 38,189.57
  4. Step 4: Simplify right side
    85,578.78x = 4,903,485,725.87
  5. Step 5: Solve for x
    x = 4,903,485,725.87/85,578.78
  6. Step 6: Final answer
    x = 57,297.92

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