Finding the Fourth Proportional to 2,647.85, 3,970.51 and 980.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.85 : 3,970.51 = 980.83 : x
2. Step 2: Convert to fraction form
   2,647.85/3,970.51 = 980.83/x
3. Step 3: Cross multiply
   2,647.85x = 3,970.51 × 980.83
4. Step 4: Simplify right side
   2,647.85x = 3,894,411.76
5. Step 5: Solve for x
   x = 3,894,411.76/2,647.85
6. Step 6: Final answer
   x = 1,470.78