Finding the Fourth Proportional to 2,439.89, 3,660.53 and 980.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.89 : 3,660.53 = 980.07 : x
2. Step 2: Convert to fraction form
   2,439.89/3,660.53 = 980.07/x
3. Step 3: Cross multiply
   2,439.89x = 3,660.53 × 980.07
4. Step 4: Simplify right side
   2,439.89x = 3,587,557.01
5. Step 5: Solve for x
   x = 3,587,557.01/2,439.89
6. Step 6: Final answer
   x = 1,470.38