Finding the Fourth Proportional to 57,123.78, 78,829.55 and 31,628.63

Step by Step Solution

1. Step 1: Write the proportion equation
   57,123.78 : 78,829.55 = 31,628.63 : x
2. Step 2: Convert to fraction form
   57,123.78/78,829.55 = 31,628.63/x
3. Step 3: Cross multiply
   57,123.78x = 78,829.55 × 31,628.63
4. Step 4: Simplify right side
   57,123.78x = 2,493,270,562.05
5. Step 5: Solve for x
   x = 2,493,270,562.05/57,123.78
6. Step 6: Final answer
   x = 43,646.80