Finding the Fourth Proportional to 22,821.20, 31,492.86 and 12,749

Step by Step Solution

1. Step 1: Write the proportion equation
   22,821.20 : 31,492.86 = 12,749 : x
2. Step 2: Convert to fraction form
   22,821.20/31,492.86 = 12,749/x
3. Step 3: Cross multiply
   22,821.20x = 31,492.86 × 12,749
4. Step 4: Simplify right side
   22,821.20x = 401,502,472.14
5. Step 5: Solve for x
   x = 401,502,472.14/22,821.20
6. Step 6: Final answer
   x = 17,593.40