Finding the Fourth Proportional to 107,239.61, 160,711.46 and 80,915.15

Step by Step Solution

1. Step 1: Write the proportion equation
   107,239.61 : 160,711.46 = 80,915.15 : x
2. Step 2: Convert to fraction form
   107,239.61/160,711.46 = 80,915.15/x
3. Step 3: Cross multiply
   107,239.61x = 160,711.46 × 80,915.15
4. Step 4: Simplify right side
   107,239.61x = 13,003,991,488.04
5. Step 5: Solve for x
   x = 13,003,991,488.04/107,239.61
6. Step 6: Final answer
   x = 121,261.09