Finding the Fourth Proportional to 3,454.78, 5,182.86 and 989.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,454.78 : 5,182.86 = 989.61 : x
2. Step 2: Convert to fraction form
   3,454.78/5,182.86 = 989.61/x
3. Step 3: Cross multiply
   3,454.78x = 5,182.86 × 989.61
4. Step 4: Simplify right side
   3,454.78x = 5,129,010.08
5. Step 5: Solve for x
   x = 5,129,010.08/3,454.78
6. Step 6: Final answer
   x = 1,484.61