Finding the Fourth Proportional to 31,078.89, 42,894.42 and 18,331.29

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.89 : 42,894.42 = 18,331.29 : x
2. Step 2: Convert to fraction form
   31,078.89/42,894.42 = 18,331.29/x
3. Step 3: Cross multiply
   31,078.89x = 42,894.42 × 18,331.29
4. Step 4: Simplify right side
   31,078.89x = 786,310,052.40
5. Step 5: Solve for x
   x = 786,310,052.40/31,078.89
6. Step 6: Final answer
   x = 25,300.45