Finding the Fourth Proportional to 57,139.30, 78,851.37 and 31,989.70

Step by Step Solution

1. Step 1: Write the proportion equation
   57,139.30 : 78,851.37 = 31,989.70 : x
2. Step 2: Convert to fraction form
   57,139.30/78,851.37 = 31,989.70/x
3. Step 3: Cross multiply
   57,139.30x = 78,851.37 × 31,989.70
4. Step 4: Simplify right side
   57,139.30x = 2,522,431,670.89
5. Step 5: Solve for x
   x = 2,522,431,670.89/57,139.30
6. Step 6: Final answer
   x = 44,145.30