Finding the Fourth Proportional to 2,539.89, 3,809.43 and 980.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.89 : 3,809.43 = 980.61 : x
2. Step 2: Convert to fraction form
   2,539.89/3,809.43 = 980.61/x
3. Step 3: Cross multiply
   2,539.89x = 3,809.43 × 980.61
4. Step 4: Simplify right side
   2,539.89x = 3,735,565.15
5. Step 5: Solve for x
   x = 3,735,565.15/2,539.89
6. Step 6: Final answer
   x = 1,470.76