Finding the Fourth Proportional to 31,153.09, 42,990.71 and 17,724.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,153.09 : 42,990.71 = 17,724.05 : x
2. Step 2: Convert to fraction form
   31,153.09/42,990.71 = 17,724.05/x
3. Step 3: Cross multiply
   31,153.09x = 42,990.71 × 17,724.05
4. Step 4: Simplify right side
   31,153.09x = 761,969,512.43
5. Step 5: Solve for x
   x = 761,969,512.43/31,153.09
6. Step 6: Final answer
   x = 24,458.88