Finding the Fourth Proportional to 22,471.03, 31,008.72 and 12,399.45

Step by Step Solution

1. Step 1: Write the proportion equation
   22,471.03 : 31,008.72 = 12,399.45 : x
2. Step 2: Convert to fraction form
   22,471.03/31,008.72 = 12,399.45/x
3. Step 3: Cross multiply
   22,471.03x = 31,008.72 × 12,399.45
4. Step 4: Simplify right side
   22,471.03x = 384,491,011.21
5. Step 5: Solve for x
   x = 384,491,011.21/22,471.03
6. Step 6: Final answer
   x = 17,110.52