Finding the Fourth Proportional to 8,123.59, 12,186.20 and 2,928.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.59 : 12,186.20 = 2,928.25 : x
2. Step 2: Convert to fraction form
   8,123.59/12,186.20 = 2,928.25/x
3. Step 3: Cross multiply
   8,123.59x = 12,186.20 × 2,928.25
4. Step 4: Simplify right side
   8,123.59x = 35,684,195.04
5. Step 5: Solve for x
   x = 35,684,195.04/8,123.59
6. Step 6: Final answer
   x = 4,392.66