Finding the Fourth Proportional to 31,068.18, 42,872.76 and 16,921.08

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.18 : 42,872.76 = 16,921.08 : x
2. Step 2: Convert to fraction form
   31,068.18/42,872.76 = 16,921.08/x
3. Step 3: Cross multiply
   31,068.18x = 42,872.76 × 16,921.08
4. Step 4: Simplify right side
   31,068.18x = 725,453,401.78
5. Step 5: Solve for x
   x = 725,453,401.78/31,068.18
6. Step 6: Final answer
   x = 23,350.37