Finding the Fourth Proportional to 1,643.49, 2,267.73 and 980.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.49 : 2,267.73 = 980.30 : x
2. Step 2: Convert to fraction form
   1,643.49/2,267.73 = 980.30/x
3. Step 3: Cross multiply
   1,643.49x = 2,267.73 × 980.30
4. Step 4: Simplify right side
   1,643.49x = 2,223,061.39
5. Step 5: Solve for x
   x = 2,223,061.39/1,643.49
6. Step 6: Final answer
   x = 1,352.65