Finding the Fourth Proportional to 22,820, 31,492.30 and 12,748.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,820 : 31,492.30 = 12,748.88 : x
2. Step 2: Convert to fraction form
   22,820/31,492.30 = 12,748.88/x
3. Step 3: Cross multiply
   22,820x = 31,492.30 × 12,748.88
4. Step 4: Simplify right side
   22,820x = 401,491,553.62
5. Step 5: Solve for x
   x = 401,491,553.62/22,820
6. Step 6: Final answer
   x = 17,593.85