Finding the Fourth Proportional to 115,857.32, 159,845.94 and 64,862.55

Step by Step Solution

1. Step 1: Write the proportion equation
   115,857.32 : 159,845.94 = 64,862.55 : x
2. Step 2: Convert to fraction form
   115,857.32/159,845.94 = 64,862.55/x
3. Step 3: Cross multiply
   115,857.32x = 159,845.94 × 64,862.55
4. Step 4: Simplify right side
   115,857.32x = 10,368,015,275.55
5. Step 5: Solve for x
   x = 10,368,015,275.55/115,857.32
6. Step 6: Final answer
   x = 89,489.52