Finding the Fourth Proportional to 12,128.76, 16,736.78 and 6,822.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.76 : 16,736.78 = 6,822.55 : x
2. Step 2: Convert to fraction form
   12,128.76/16,736.78 = 6,822.55/x
3. Step 3: Cross multiply
   12,128.76x = 16,736.78 × 6,822.55
4. Step 4: Simplify right side
   12,128.76x = 114,187,493.60
5. Step 5: Solve for x
   x = 114,187,493.60/12,128.76
6. Step 6: Final answer
   x = 9,414.61