Finding the Fourth Proportional to 102,300.50, 141,179.05 and 56,978.47

Step by Step Solution

1. Step 1: Write the proportion equation
   102,300.50 : 141,179.05 = 56,978.47 : x
2. Step 2: Convert to fraction form
   102,300.50/141,179.05 = 56,978.47/x
3. Step 3: Cross multiply
   102,300.50x = 141,179.05 × 56,978.47
4. Step 4: Simplify right side
   102,300.50x = 8,044,166,512.75
5. Step 5: Solve for x
   x = 8,044,166,512.75/102,300.50
6. Step 6: Final answer
   x = 78,632.72