Finding the Fourth Proportional to 2,488.72, 3,731.85 and 928.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.72 : 3,731.85 = 928.06 : x
2. Step 2: Convert to fraction form
   2,488.72/3,731.85 = 928.06/x
3. Step 3: Cross multiply
   2,488.72x = 3,731.85 × 928.06
4. Step 4: Simplify right side
   2,488.72x = 3,463,380.71
5. Step 5: Solve for x
   x = 3,463,380.71/2,488.72
6. Step 6: Final answer
   x = 1,391.63