Finding the Fourth Proportional to 102,500.75, 141,450.98 and 57,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,500.75 : 141,450.98 = 57,178.72 : x
2. Step 2: Convert to fraction form
   102,500.75/141,450.98 = 57,178.72/x
3. Step 3: Cross multiply
   102,500.75x = 141,450.98 × 57,178.72
4. Step 4: Simplify right side
   102,500.75x = 8,087,985,870.07
5. Step 5: Solve for x
   x = 8,087,985,870.07/102,500.75
6. Step 6: Final answer
   x = 78,906.60