Finding the Fourth Proportional to 22,196.93, 30,628.98 and 12,638.07

Step by Step Solution

1. Step 1: Write the proportion equation
   22,196.93 : 30,628.98 = 12,638.07 : x
2. Step 2: Convert to fraction form
   22,196.93/30,628.98 = 12,638.07/x
3. Step 3: Cross multiply
   22,196.93x = 30,628.98 × 12,638.07
4. Step 4: Simplify right side
   22,196.93x = 387,091,193.27
5. Step 5: Solve for x
   x = 387,091,193.27/22,196.93
6. Step 6: Final answer
   x = 17,438.96