Finding the Fourth Proportional to 115,992.38, 160,080.72 and 65,013.78

Step by Step Solution

1. Step 1: Write the proportion equation
   115,992.38 : 160,080.72 = 65,013.78 : x
2. Step 2: Convert to fraction form
   115,992.38/160,080.72 = 65,013.78/x
3. Step 3: Cross multiply
   115,992.38x = 160,080.72 × 65,013.78
4. Step 4: Simplify right side
   115,992.38x = 10,407,452,712.32
5. Step 5: Solve for x
   x = 10,407,452,712.32/115,992.38
6. Step 6: Final answer
   x = 89,725.31