Finding the Fourth Proportional to 22,478.40, 31,017.98 and 12,406.19

Step by Step Solution

1. Step 1: Write the proportion equation
   22,478.40 : 31,017.98 = 12,406.19 : x
2. Step 2: Convert to fraction form
   22,478.40/31,017.98 = 12,406.19/x
3. Step 3: Cross multiply
   22,478.40x = 31,017.98 × 12,406.19
4. Step 4: Simplify right side
   22,478.40x = 384,814,953.30
5. Step 5: Solve for x
   x = 384,814,953.30/22,478.40
6. Step 6: Final answer
   x = 17,119.32