Finding the Fourth Proportional to 81,155.34, 112,025.58 and 72,642.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,155.34 : 112,025.58 = 72,642.42 : x
2. Step 2: Convert to fraction form
   81,155.34/112,025.58 = 72,642.42/x
3. Step 3: Cross multiply
   81,155.34x = 112,025.58 × 72,642.42
4. Step 4: Simplify right side
   81,155.34x = 8,137,809,233.10
5. Step 5: Solve for x
   x = 8,137,809,233.10/81,155.34
6. Step 6: Final answer
   x = 100,274.48