Finding the Fourth Proportional to 31,066.80, 42,872.24 and 16,919.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,066.80 : 42,872.24 = 16,919.72 : x
2. Step 2: Convert to fraction form
   31,066.80/42,872.24 = 16,919.72/x
3. Step 3: Cross multiply
   31,066.80x = 42,872.24 × 16,919.72
4. Step 4: Simplify right side
   31,066.80x = 725,386,296.57
5. Step 5: Solve for x
   x = 725,386,296.57/31,066.80
6. Step 6: Final answer
   x = 23,349.24