Finding the Fourth Proportional to 30,871.31, 42,602.63 and 16,724.17

Step by Step Solution

1. Step 1: Write the proportion equation
   30,871.31 : 42,602.63 = 16,724.17 : x
2. Step 2: Convert to fraction form
   30,871.31/42,602.63 = 16,724.17/x
3. Step 3: Cross multiply
   30,871.31x = 42,602.63 × 16,724.17
4. Step 4: Simplify right side
   30,871.31x = 712,493,626.57
5. Step 5: Solve for x
   x = 712,493,626.57/30,871.31
6. Step 6: Final answer
   x = 23,079.47