Finding the Fourth Proportional to 57,111.28, 78,811.85 and 31,618.69

Step by Step Solution

1. Step 1: Write the proportion equation
   57,111.28 : 78,811.85 = 31,618.69 : x
2. Step 2: Convert to fraction form
   57,111.28/78,811.85 = 31,618.69/x
3. Step 3: Cross multiply
   57,111.28x = 78,811.85 × 31,618.69
4. Step 4: Simplify right side
   57,111.28x = 2,491,927,335.49
5. Step 5: Solve for x
   x = 2,491,927,335.49/57,111.28
6. Step 6: Final answer
   x = 43,632.84