Finding the Fourth Proportional to 92,772.76, 128,092.98 and 57,010.72

Step by Step Solution

1. Step 1: Write the proportion equation
   92,772.76 : 128,092.98 = 57,010.72 : x
2. Step 2: Convert to fraction form
   92,772.76/128,092.98 = 57,010.72/x
3. Step 3: Cross multiply
   92,772.76x = 128,092.98 × 57,010.72
4. Step 4: Simplify right side
   92,772.76x = 7,302,673,016.75
5. Step 5: Solve for x
   x = 7,302,673,016.75/92,772.76
6. Step 6: Final answer
   x = 78,715.70