Finding the Fourth Proportional to 22,820.89, 31,489.70 and 12,748.08

Step by Step Solution

1. Step 1: Write the proportion equation
   22,820.89 : 31,489.70 = 12,748.08 : x
2. Step 2: Convert to fraction form
   22,820.89/31,489.70 = 12,748.08/x
3. Step 3: Cross multiply
   22,820.89x = 31,489.70 × 12,748.08
4. Step 4: Simplify right side
   22,820.89x = 401,433,214.78
5. Step 5: Solve for x
   x = 401,433,214.78/22,820.89
6. Step 6: Final answer
   x = 17,590.60