Finding the Fourth Proportional to 31,024.80, 42,813.72 and 16,878

Step by Step Solution

1. Step 1: Write the proportion equation
   31,024.80 : 42,813.72 = 16,878 : x
2. Step 2: Convert to fraction form
   31,024.80/42,813.72 = 16,878/x
3. Step 3: Cross multiply
   31,024.80x = 42,813.72 × 16,878
4. Step 4: Simplify right side
   31,024.80x = 722,609,966.16
5. Step 5: Solve for x
   x = 722,609,966.16/31,024.80
6. Step 6: Final answer
   x = 23,291.37