Finding the Fourth Proportional to 3,078.48, 4,617.86 and 998.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,078.48 : 4,617.86 = 998.31 : x
2. Step 2: Convert to fraction form
   3,078.48/4,617.86 = 998.31/x
3. Step 3: Cross multiply
   3,078.48x = 4,617.86 × 998.31
4. Step 4: Simplify right side
   3,078.48x = 4,610,050.83
5. Step 5: Solve for x
   x = 4,610,050.83/3,078.48
6. Step 6: Final answer
   x = 1,497.51