Finding the Fourth Proportional to 57,021.59, 78,686.61 and 31,526.47

Step by Step Solution

1. Step 1: Write the proportion equation
   57,021.59 : 78,686.61 = 31,526.47 : x
2. Step 2: Convert to fraction form
   57,021.59/78,686.61 = 31,526.47/x
3. Step 3: Cross multiply
   57,021.59x = 78,686.61 × 31,526.47
4. Step 4: Simplify right side
   57,021.59x = 2,480,711,049.57
5. Step 5: Solve for x
   x = 2,480,711,049.57/57,021.59
6. Step 6: Final answer
   x = 43,504.77