Finding the Fourth Proportional to 89,671.18, 123,694.56 and 56,078.86

Step by Step Solution

1. Step 1: Write the proportion equation
   89,671.18 : 123,694.56 = 56,078.86 : x
2. Step 2: Convert to fraction form
   89,671.18/123,694.56 = 56,078.86/x
3. Step 3: Cross multiply
   89,671.18x = 123,694.56 × 56,078.86
4. Step 4: Simplify right side
   89,671.18x = 6,936,649,913.00
5. Step 5: Solve for x
   x = 6,936,649,913.00/89,671.18
6. Step 6: Final answer
   x = 77,356.51