Finding the Fourth Proportional to 31,151.39, 42,983.85 and 18,402.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,151.39 : 42,983.85 = 18,402.80 : x
2. Step 2: Convert to fraction form
   31,151.39/42,983.85 = 18,402.80/x
3. Step 3: Cross multiply
   31,151.39x = 42,983.85 × 18,402.80
4. Step 4: Simplify right side
   31,151.39x = 791,023,194.78
5. Step 5: Solve for x
   x = 791,023,194.78/31,151.39
6. Step 6: Final answer
   x = 25,392.87