Finding the Fourth Proportional to 115,687.46, 159,647.54 and 64,699.60

Step by Step Solution

1. Step 1: Write the proportion equation
   115,687.46 : 159,647.54 = 64,699.60 : x
2. Step 2: Convert to fraction form
   115,687.46/159,647.54 = 64,699.60/x
3. Step 3: Cross multiply
   115,687.46x = 159,647.54 × 64,699.60
4. Step 4: Simplify right side
   115,687.46x = 10,329,131,978.98
5. Step 5: Solve for x
   x = 10,329,131,978.98/115,687.46
6. Step 6: Final answer
   x = 89,284.80