Finding the Fourth Proportional to 31,066.96, 42,873.32 and 16,920.40

Step by Step Solution

1. Step 1: Write the proportion equation
   31,066.96 : 42,873.32 = 16,920.40 : x
2. Step 2: Convert to fraction form
   31,066.96/42,873.32 = 16,920.40/x
3. Step 3: Cross multiply
   31,066.96x = 42,873.32 × 16,920.40
4. Step 4: Simplify right side
   31,066.96x = 725,433,723.73
5. Step 5: Solve for x
   x = 725,433,723.73/31,066.96
6. Step 6: Final answer
   x = 23,350.65