Finding the Fourth Proportional to 22,892.79, 31,588.39 and 12,821.65

Step by Step Solution

1. Step 1: Write the proportion equation
   22,892.79 : 31,588.39 = 12,821.65 : x
2. Step 2: Convert to fraction form
   22,892.79/31,588.39 = 12,821.65/x
3. Step 3: Cross multiply
   22,892.79x = 31,588.39 × 12,821.65
4. Step 4: Simplify right side
   22,892.79x = 405,015,280.64
5. Step 5: Solve for x
   x = 405,015,280.64/22,892.79
6. Step 6: Final answer
   x = 17,691.83