Finding the Fourth Proportional to 57,142.74, 78,855.84 and 31,649.31

Step by Step Solution

1. Step 1: Write the proportion equation
   57,142.74 : 78,855.84 = 31,649.31 : x
2. Step 2: Convert to fraction form
   57,142.74/78,855.84 = 31,649.31/x
3. Step 3: Cross multiply
   57,142.74x = 78,855.84 × 31,649.31
4. Step 4: Simplify right side
   57,142.74x = 2,495,732,987.73
5. Step 5: Solve for x
   x = 2,495,732,987.73/57,142.74
6. Step 6: Final answer
   x = 43,675.42