Finding the Fourth Proportional to 91,724.72, 126,526.46 and 57,679.30

Step by Step Solution

1. Step 1: Write the proportion equation
   91,724.72 : 126,526.46 = 57,679.30 : x
2. Step 2: Convert to fraction form
   91,724.72/126,526.46 = 57,679.30/x
3. Step 3: Cross multiply
   91,724.72x = 126,526.46 × 57,679.30
4. Step 4: Simplify right side
   91,724.72x = 7,297,957,644.28
5. Step 5: Solve for x
   x = 7,297,957,644.28/91,724.72
6. Step 6: Final answer
   x = 79,563.69