Finding the Fourth Proportional to 22,196.99, 30,630.92 and 12,638.29

Step by Step Solution

1. Step 1: Write the proportion equation
   22,196.99 : 30,630.92 = 12,638.29 : x
2. Step 2: Convert to fraction form
   22,196.99/30,630.92 = 12,638.29/x
3. Step 3: Cross multiply
   22,196.99x = 30,630.92 × 12,638.29
4. Step 4: Simplify right side
   22,196.99x = 387,122,449.93
5. Step 5: Solve for x
   x = 387,122,449.93/22,196.99
6. Step 6: Final answer
   x = 17,440.31