Finding the Fourth Proportional to 22,820.19, 31,491.51 and 12,748.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,820.19 : 31,491.51 = 12,748.78 : x
2. Step 2: Convert to fraction form
   22,820.19/31,491.51 = 12,748.78/x
3. Step 3: Cross multiply
   22,820.19x = 31,491.51 × 12,748.78
4. Step 4: Simplify right side
   22,820.19x = 401,478,332.86
5. Step 5: Solve for x
   x = 401,478,332.86/22,820.19
6. Step 6: Final answer
   x = 17,593.12