Finding the Fourth Proportional to 2,213.57, 3,321.18 and 980.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.57 : 3,321.18 = 980.10 : x
2. Step 2: Convert to fraction form
   2,213.57/3,321.18 = 980.10/x
3. Step 3: Cross multiply
   2,213.57x = 3,321.18 × 980.10
4. Step 4: Simplify right side
   2,213.57x = 3,255,088.52
5. Step 5: Solve for x
   x = 3,255,088.52/2,213.57
6. Step 6: Final answer
   x = 1,470.51