Finding the Fourth Proportional to 1,643.87, 2,268.17 and 980.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.87 : 2,268.17 = 980.59 : x
2. Step 2: Convert to fraction form
   1,643.87/2,268.17 = 980.59/x
3. Step 3: Cross multiply
   1,643.87x = 2,268.17 × 980.59
4. Step 4: Simplify right side
   1,643.87x = 2,224,144.82
5. Step 5: Solve for x
   x = 2,224,144.82/1,643.87
6. Step 6: Final answer
   x = 1,352.99