Finding the Fourth Proportional to 30,868.61, 42,598.98 and 16,721.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,868.61 : 42,598.98 = 16,721.75 : x
2. Step 2: Convert to fraction form
   30,868.61/42,598.98 = 16,721.75/x
3. Step 3: Cross multiply
   30,868.61x = 42,598.98 × 16,721.75
4. Step 4: Simplify right side
   30,868.61x = 712,329,600.31
5. Step 5: Solve for x
   x = 712,329,600.31/30,868.61
6. Step 6: Final answer
   x = 23,076.18