Finding the Fourth Proportional to 22,820.20, 31,491.48 and 12,748

Step by Step Solution

1. Step 1: Write the proportion equation
   22,820.20 : 31,491.48 = 12,748 : x
2. Step 2: Convert to fraction form
   22,820.20/31,491.48 = 12,748/x
3. Step 3: Cross multiply
   22,820.20x = 31,491.48 × 12,748
4. Step 4: Simplify right side
   22,820.20x = 401,453,387.04
5. Step 5: Solve for x
   x = 401,453,387.04/22,820.20
6. Step 6: Final answer
   x = 17,592.02