Finding the Fourth Proportional to 31,068.16, 42,872.76 and 16,920.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.16 : 42,872.76 = 16,920.96 : x
2. Step 2: Convert to fraction form
   31,068.16/42,872.76 = 16,920.96/x
3. Step 3: Cross multiply
   31,068.16x = 42,872.76 × 16,920.96
4. Step 4: Simplify right side
   31,068.16x = 725,448,257.05
5. Step 5: Solve for x
   x = 725,448,257.05/31,068.16
6. Step 6: Final answer
   x = 23,350.22