Finding the Fourth Proportional to 22,208.72, 30,649.22 and 12,778.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,208.72 : 30,649.22 = 12,778.72 : x
2. Step 2: Convert to fraction form
   22,208.72/30,649.22 = 12,778.72/x
3. Step 3: Cross multiply
   22,208.72x = 30,649.22 × 12,778.72
4. Step 4: Simplify right side
   22,208.72x = 391,657,800.60
5. Step 5: Solve for x
   x = 391,657,800.60/22,208.72
6. Step 6: Final answer
   x = 17,635.32