Finding the Fourth Proportional to 30,878.88, 42,612.88 and 16,731.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,878.88 : 42,612.88 = 16,731.72 : x
2. Step 2: Convert to fraction form
   30,878.88/42,612.88 = 16,731.72/x
3. Step 3: Cross multiply
   30,878.88x = 42,612.88 × 16,731.72
4. Step 4: Simplify right side
   30,878.88x = 712,986,776.55
5. Step 5: Solve for x
   x = 712,986,776.55/30,878.88
6. Step 6: Final answer
   x = 23,089.79