Finding the Fourth Proportional to 81,158.34, 112,029.72 and 72,645.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,158.34 : 112,029.72 = 72,645.42 : x
2. Step 2: Convert to fraction form
   81,158.34/112,029.72 = 72,645.42/x
3. Step 3: Cross multiply
   81,158.34x = 112,029.72 × 72,645.42
4. Step 4: Simplify right side
   81,158.34x = 8,138,446,061.88
5. Step 5: Solve for x
   x = 8,138,446,061.88/81,158.34
6. Step 6: Final answer
   x = 100,278.62