Finding the Fourth Proportional to 2,225.72, 3,339.78 and 928.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.72 : 3,339.78 = 928.08 : x
2. Step 2: Convert to fraction form
   2,225.72/3,339.78 = 928.08/x
3. Step 3: Cross multiply
   2,225.72x = 3,339.78 × 928.08
4. Step 4: Simplify right side
   2,225.72x = 3,099,583.02
5. Step 5: Solve for x
   x = 3,099,583.02/2,225.72
6. Step 6: Final answer
   x = 1,392.62