Finding the Fourth Proportional to 20,892.17, 31,342.82 and 8,412.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,892.17 : 31,342.82 = 8,412.62 : x
2. Step 2: Convert to fraction form
   20,892.17/31,342.82 = 8,412.62/x
3. Step 3: Cross multiply
   20,892.17x = 31,342.82 × 8,412.62
4. Step 4: Simplify right side
   20,892.17x = 263,675,035.61
5. Step 5: Solve for x
   x = 263,675,035.61/20,892.17
6. Step 6: Final answer
   x = 12,620.76