Finding the Fourth Proportional to 91,301.89, 126,031.71 and 81,724.86

Step by Step Solution

1. Step 1: Write the proportion equation
   91,301.89 : 126,031.71 = 81,724.86 : x
2. Step 2: Convert to fraction form
   91,301.89/126,031.71 = 81,724.86/x
3. Step 3: Cross multiply
   91,301.89x = 126,031.71 × 81,724.86
4. Step 4: Simplify right side
   91,301.89x = 10,299,923,855.31
5. Step 5: Solve for x
   x = 10,299,923,855.31/91,301.89
6. Step 6: Final answer
   x = 112,811.73