Finding the Fourth Proportional to 91,223.20, 125,404.76 and 78,429.25

Step by Step Solution

1. Step 1: Write the proportion equation
   91,223.20 : 125,404.76 = 78,429.25 : x
2. Step 2: Convert to fraction form
   91,223.20/125,404.76 = 78,429.25/x
3. Step 3: Cross multiply
   91,223.20x = 125,404.76 × 78,429.25
4. Step 4: Simplify right side
   91,223.20x = 9,835,401,273.23
5. Step 5: Solve for x
   x = 9,835,401,273.23/91,223.20
6. Step 6: Final answer
   x = 107,816.89