Finding the Fourth Proportional to 12,128.58, 16,738.38 and 6,823.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.58 : 16,738.38 = 6,823.89 : x
2. Step 2: Convert to fraction form
   12,128.58/16,738.38 = 6,823.89/x
3. Step 3: Cross multiply
   12,128.58x = 16,738.38 × 6,823.89
4. Step 4: Simplify right side
   12,128.58x = 114,220,863.90
5. Step 5: Solve for x
   x = 114,220,863.90/12,128.58
6. Step 6: Final answer
   x = 9,417.50