Finding the Fourth Proportional to 115,868.72, 159,890.28 and 65,558

Step by Step Solution

1. Step 1: Write the proportion equation
   115,868.72 : 159,890.28 = 65,558 : x
2. Step 2: Convert to fraction form
   115,868.72/159,890.28 = 65,558/x
3. Step 3: Cross multiply
   115,868.72x = 159,890.28 × 65,558
4. Step 4: Simplify right side
   115,868.72x = 10,482,086,976.24
5. Step 5: Solve for x
   x = 10,482,086,976.24/115,868.72
6. Step 6: Final answer
   x = 90,465.20