Finding the Fourth Proportional to 31,068.88, 42,875.12 and 16,921.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.88 : 42,875.12 = 16,921.68 : x
2. Step 2: Convert to fraction form
   31,068.88/42,875.12 = 16,921.68/x
3. Step 3: Cross multiply
   31,068.88x = 42,875.12 × 16,921.68
4. Step 4: Simplify right side
   31,068.88x = 725,519,060.60
5. Step 5: Solve for x
   x = 725,519,060.60/31,068.88
6. Step 6: Final answer
   x = 23,351.95