Finding the Fourth Proportional to 91,191.24, 125,840.61 and 57,218.04

Step by Step Solution

1. Step 1: Write the proportion equation
   91,191.24 : 125,840.61 = 57,218.04 : x
2. Step 2: Convert to fraction form
   91,191.24/125,840.61 = 57,218.04/x
3. Step 3: Cross multiply
   91,191.24x = 125,840.61 × 57,218.04
4. Step 4: Simplify right side
   91,191.24x = 7,200,353,056.60
5. Step 5: Solve for x
   x = 7,200,353,056.60/91,191.24
6. Step 6: Final answer
   x = 78,958.82