Finding the Fourth Proportional to 91,020.87, 125,662.69 and 80,921.42

Step by Step Solution

1. Step 1: Write the proportion equation
   91,020.87 : 125,662.69 = 80,921.42 : x
2. Step 2: Convert to fraction form
   91,020.87/125,662.69 = 80,921.42/x
3. Step 3: Cross multiply
   91,020.87x = 125,662.69 × 80,921.42
4. Step 4: Simplify right side
   91,020.87x = 10,168,803,052.24
5. Step 5: Solve for x
   x = 10,168,803,052.24/91,020.87
6. Step 6: Final answer
   x = 111,719.46