Finding the Fourth Proportional to 22,479.40, 31,021.86 and 12,407.86

Step by Step Solution

1. Step 1: Write the proportion equation
   22,479.40 : 31,021.86 = 12,407.86 : x
2. Step 2: Convert to fraction form
   22,479.40/31,021.86 = 12,407.86/x
3. Step 3: Cross multiply
   22,479.40x = 31,021.86 × 12,407.86
4. Step 4: Simplify right side
   22,479.40x = 384,914,895.82
5. Step 5: Solve for x
   x = 384,914,895.82/22,479.40
6. Step 6: Final answer
   x = 17,123.01