Finding the Fourth Proportional to 30,718.52, 42,391.72 and 17,290

Step by Step Solution

1. Step 1: Write the proportion equation
   30,718.52 : 42,391.72 = 17,290 : x
2. Step 2: Convert to fraction form
   30,718.52/42,391.72 = 17,290/x
3. Step 3: Cross multiply
   30,718.52x = 42,391.72 × 17,290
4. Step 4: Simplify right side
   30,718.52x = 732,952,838.80
5. Step 5: Solve for x
   x = 732,952,838.80/30,718.52
6. Step 6: Final answer
   x = 23,860.29