Finding the Fourth Proportional to 90,706.43, 125,131.33 and 78,109.31

Step by Step Solution

1. Step 1: Write the proportion equation
   90,706.43 : 125,131.33 = 78,109.31 : x
2. Step 2: Convert to fraction form
   90,706.43/125,131.33 = 78,109.31/x
3. Step 3: Cross multiply
   90,706.43x = 125,131.33 × 78,109.31
4. Step 4: Simplify right side
   90,706.43x = 9,773,922,256.15
5. Step 5: Solve for x
   x = 9,773,922,256.15/90,706.43
6. Step 6: Final answer
   x = 107,753.35