Finding the Fourth Proportional to 96,560.41, 144,851.55 and 86,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   96,560.41 : 144,851.55 = 86,638.72 : x
2. Step 2: Convert to fraction form
   96,560.41/144,851.55 = 86,638.72/x
3. Step 3: Cross multiply
   96,560.41x = 144,851.55 × 86,638.72
4. Step 4: Simplify right side
   96,560.41x = 12,549,752,882.02
5. Step 5: Solve for x
   x = 12,549,752,882.02/96,560.41
6. Step 6: Final answer
   x = 129,967.89