Finding the Fourth Proportional to 81,161.34, 112,033.86 and 72,648.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,161.34 : 112,033.86 = 72,648.42 : x
2. Step 2: Convert to fraction form
   81,161.34/112,033.86 = 72,648.42/x
3. Step 3: Cross multiply
   81,161.34x = 112,033.86 × 72,648.42
4. Step 4: Simplify right side
   81,161.34x = 8,139,082,915.50
5. Step 5: Solve for x
   x = 8,139,082,915.50/81,161.34
6. Step 6: Final answer
   x = 100,282.76