Finding the Fourth Proportional to 79,081.68, 109,128.56 and 45,091.20

Step by Step Solution

1. Step 1: Write the proportion equation
   79,081.68 : 109,128.56 = 45,091.20 : x
2. Step 2: Convert to fraction form
   79,081.68/109,128.56 = 45,091.20/x
3. Step 3: Cross multiply
   79,081.68x = 109,128.56 × 45,091.20
4. Step 4: Simplify right side
   79,081.68x = 4,920,737,724.67
5. Step 5: Solve for x
   x = 4,920,737,724.67/79,081.68
6. Step 6: Final answer
   x = 62,223.48