Finding the Fourth Proportional to 22,515.12, 31,071.06 and 12,443.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,515.12 : 31,071.06 = 12,443.40 : x
2. Step 2: Convert to fraction form
   22,515.12/31,071.06 = 12,443.40/x
3. Step 3: Cross multiply
   22,515.12x = 31,071.06 × 12,443.40
4. Step 4: Simplify right side
   22,515.12x = 386,629,628.00
5. Step 5: Solve for x
   x = 386,629,628.00/22,515.12
6. Step 6: Final answer
   x = 17,172.00