Finding the Fourth Proportional to 64,137.72, 88,534.80 and 57,411.48

Step by Step Solution

1. Step 1: Write the proportion equation
   64,137.72 : 88,534.80 = 57,411.48 : x
2. Step 2: Convert to fraction form
   64,137.72/88,534.80 = 57,411.48/x
3. Step 3: Cross multiply
   64,137.72x = 88,534.80 × 57,411.48
4. Step 4: Simplify right side
   64,137.72x = 5,082,913,899.50
5. Step 5: Solve for x
   x = 5,082,913,899.50/64,137.72
6. Step 6: Final answer
   x = 79,249.99