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Finding the Fourth Proportional to 256,390.86, 384,622.74 and 78,912.66

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Solution

The fourth proportional to 256,390.86, 384,622.74 and 78,912.66 is: 118,380.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,390.86 : 384,622.74 = 78,912.66 : x
  2. Step 2: Convert to fraction form
    256,390.86/384,622.74 = 78,912.66/x
  3. Step 3: Cross multiply
    256,390.86x = 384,622.74 × 78,912.66
  4. Step 4: Simplify right side
    256,390.86x = 30,351,603,509.89
  5. Step 5: Solve for x
    x = 30,351,603,509.89/256,390.86
  6. Step 6: Final answer
    x = 118,380.21

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