Finding the Fourth Proportional to 1,643.82, 2,268.94 and 980.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.82 : 2,268.94 = 980.82 : x
2. Step 2: Convert to fraction form
   1,643.82/2,268.94 = 980.82/x
3. Step 3: Cross multiply
   1,643.82x = 2,268.94 × 980.82
4. Step 4: Simplify right side
   1,643.82x = 2,225,421.73
5. Step 5: Solve for x
   x = 2,225,421.73/1,643.82
6. Step 6: Final answer
   x = 1,353.81