Finding the Fourth Proportional to 57,510.72, 78,847.20 and 56,460.96

Step by Step Solution

1. Step 1: Write the proportion equation
   57,510.72 : 78,847.20 = 56,460.96 : x
2. Step 2: Convert to fraction form
   57,510.72/78,847.20 = 56,460.96/x
3. Step 3: Cross multiply
   57,510.72x = 78,847.20 × 56,460.96
4. Step 4: Simplify right side
   57,510.72x = 4,451,788,605.31
5. Step 5: Solve for x
   x = 4,451,788,605.31/57,510.72
6. Step 6: Final answer
   x = 77,407.98