Finding the Fourth Proportional to 31,159.81, 42,991.23 and 18,414.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,159.81 : 42,991.23 = 18,414.15 : x
2. Step 2: Convert to fraction form
   31,159.81/42,991.23 = 18,414.15/x
3. Step 3: Cross multiply
   31,159.81x = 42,991.23 × 18,414.15
4. Step 4: Simplify right side
   31,159.81x = 791,646,957.90
5. Step 5: Solve for x
   x = 791,646,957.90/31,159.81
6. Step 6: Final answer
   x = 25,406.03