Finding the Fourth Proportional to 22,515.18, 31,071 and 12,443.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,515.18 : 31,071 = 12,443.40 : x
2. Step 2: Convert to fraction form
   22,515.18/31,071 = 12,443.40/x
3. Step 3: Cross multiply
   22,515.18x = 31,071 × 12,443.40
4. Step 4: Simplify right side
   22,515.18x = 386,628,881.40
5. Step 5: Solve for x
   x = 386,628,881.40/22,515.18
6. Step 6: Final answer
   x = 17,171.92