Finding the Fourth Proportional to 3,478.56, 5,218.14 and 980.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,478.56 : 5,218.14 = 980.10 : x
2. Step 2: Convert to fraction form
   3,478.56/5,218.14 = 980.10/x
3. Step 3: Cross multiply
   3,478.56x = 5,218.14 × 980.10
4. Step 4: Simplify right side
   3,478.56x = 5,114,299.01
5. Step 5: Solve for x
   x = 5,114,299.01/3,478.56
6. Step 6: Final answer
   x = 1,470.23