Finding the Fourth Proportional to 87,549.18, 121,633.52 and 86,499.42

Step by Step Solution

1. Step 1: Write the proportion equation
   87,549.18 : 121,633.52 = 86,499.42 : x
2. Step 2: Convert to fraction form
   87,549.18/121,633.52 = 86,499.42/x
3. Step 3: Cross multiply
   87,549.18x = 121,633.52 × 86,499.42
4. Step 4: Simplify right side
   87,549.18x = 10,521,228,043.94
5. Step 5: Solve for x
   x = 10,521,228,043.94/87,549.18
6. Step 6: Final answer
   x = 120,175.07