Finding the Fourth Proportional to 115,689.60, 159,648.57 and 65,388.60

Step by Step Solution

1. Step 1: Write the proportion equation
   115,689.60 : 159,648.57 = 65,388.60 : x
2. Step 2: Convert to fraction form
   115,689.60/159,648.57 = 65,388.60/x
3. Step 3: Cross multiply
   115,689.60x = 159,648.57 × 65,388.60
4. Step 4: Simplify right side
   115,689.60x = 10,439,196,484.30
5. Step 5: Solve for x
   x = 10,439,196,484.30/115,689.60
6. Step 6: Final answer
   x = 90,234.53