Finding the Fourth Proportional to 81,113.68, 111,123.88 and 78,081.34

Step by Step Solution

1. Step 1: Write the proportion equation
   81,113.68 : 111,123.88 = 78,081.34 : x
2. Step 2: Convert to fraction form
   81,113.68/111,123.88 = 78,081.34/x
3. Step 3: Cross multiply
   81,113.68x = 111,123.88 × 78,081.34
4. Step 4: Simplify right side
   81,113.68x = 8,676,701,456.40
5. Step 5: Solve for x
   x = 8,676,701,456.40/81,113.68
6. Step 6: Final answer
   x = 106,969.64