Finding the Fourth Proportional to 64,700.96, 88,810.31 and 57,469.28

Step by Step Solution

1. Step 1: Write the proportion equation
   64,700.96 : 88,810.31 = 57,469.28 : x
2. Step 2: Convert to fraction form
   64,700.96/88,810.31 = 57,469.28/x
3. Step 3: Cross multiply
   64,700.96x = 88,810.31 × 57,469.28
4. Step 4: Simplify right side
   64,700.96x = 5,103,863,840.88
5. Step 5: Solve for x
   x = 5,103,863,840.88/64,700.96
6. Step 6: Final answer
   x = 78,883.90