Finding the Fourth Proportional to 30,868.67, 42,598.72 and 16,721.57

Step by Step Solution

1. Step 1: Write the proportion equation
   30,868.67 : 42,598.72 = 16,721.57 : x
2. Step 2: Convert to fraction form
   30,868.67/42,598.72 = 16,721.57/x
3. Step 3: Cross multiply
   30,868.67x = 42,598.72 × 16,721.57
4. Step 4: Simplify right side
   30,868.67x = 712,317,478.39
5. Step 5: Solve for x
   x = 712,317,478.39/30,868.67
6. Step 6: Final answer
   x = 23,075.74