Finding the Fourth Proportional to 42,391.89, 58,468.50 and 31,057.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,391.89 : 58,468.50 = 31,057.29 : x
2. Step 2: Convert to fraction form
   42,391.89/58,468.50 = 31,057.29/x
3. Step 3: Cross multiply
   42,391.89x = 58,468.50 × 31,057.29
4. Step 4: Simplify right side
   42,391.89x = 1,815,873,160.37
5. Step 5: Solve for x
   x = 1,815,873,160.37/42,391.89
6. Step 6: Final answer
   x = 42,835.39