Finding the Fourth Proportional to 57,178.24, 78,906.43 and 31,685.03

Step by Step Solution

1. Step 1: Write the proportion equation
   57,178.24 : 78,906.43 = 31,685.03 : x
2. Step 2: Convert to fraction form
   57,178.24/78,906.43 = 31,685.03/x
3. Step 3: Cross multiply
   57,178.24x = 78,906.43 × 31,685.03
4. Step 4: Simplify right side
   57,178.24x = 2,500,152,503.42
5. Step 5: Solve for x
   x = 2,500,152,503.42/57,178.24
6. Step 6: Final answer
   x = 43,725.59