Finding the Fourth Proportional to 22,479.60, 31,021.22 and 12,407.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,479.60 : 31,021.22 = 12,407.30 : x
2. Step 2: Convert to fraction form
   22,479.60/31,021.22 = 12,407.30/x
3. Step 3: Cross multiply
   22,479.60x = 31,021.22 × 12,407.30
4. Step 4: Simplify right side
   22,479.60x = 384,889,458.82
5. Step 5: Solve for x
   x = 384,889,458.82/22,479.60
6. Step 6: Final answer
   x = 17,121.72