Finding the Fourth Proportional to 31,154.28, 42,991.40 and 17,724.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,154.28 : 42,991.40 = 17,724.28 : x
2. Step 2: Convert to fraction form
   31,154.28/42,991.40 = 17,724.28/x
3. Step 3: Cross multiply
   31,154.28x = 42,991.40 × 17,724.28
4. Step 4: Simplify right side
   31,154.28x = 761,991,522.57
5. Step 5: Solve for x
   x = 761,991,522.57/31,154.28
6. Step 6: Final answer
   x = 24,458.65