Finding the Fourth Proportional to 22,715.22, 31,346.78 and 12,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,715.22 : 31,346.78 = 12,643.50 : x
2. Step 2: Convert to fraction form
   22,715.22/31,346.78 = 12,643.50/x
3. Step 3: Cross multiply
   22,715.22x = 31,346.78 × 12,643.50
4. Step 4: Simplify right side
   22,715.22x = 396,333,012.93
5. Step 5: Solve for x
   x = 396,333,012.93/22,715.22
6. Step 6: Final answer
   x = 17,447.91