Finding the Fourth Proportional to 31,426.40, 43,356.06 and 17,990.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,426.40 : 43,356.06 = 17,990.42 : x
2. Step 2: Convert to fraction form
   31,426.40/43,356.06 = 17,990.42/x
3. Step 3: Cross multiply
   31,426.40x = 43,356.06 × 17,990.42
4. Step 4: Simplify right side
   31,426.40x = 779,993,512.16
5. Step 5: Solve for x
   x = 779,993,512.16/31,426.40
6. Step 6: Final answer
   x = 24,819.69