Finding the Fourth Proportional to 22,479.56, 31,019.57 and 12,407.35

Step by Step Solution

1. Step 1: Write the proportion equation
   22,479.56 : 31,019.57 = 12,407.35 : x
2. Step 2: Convert to fraction form
   22,479.56/31,019.57 = 12,407.35/x
3. Step 3: Cross multiply
   22,479.56x = 31,019.57 × 12,407.35
4. Step 4: Simplify right side
   22,479.56x = 384,870,615.31
5. Step 5: Solve for x
   x = 384,870,615.31/22,479.56
6. Step 6: Final answer
   x = 17,120.92