Finding the Fourth Proportional to 1,643.88, 2,268.56 and 981.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.88 : 2,268.56 = 981.03 : x
2. Step 2: Convert to fraction form
   1,643.88/2,268.56 = 981.03/x
3. Step 3: Cross multiply
   1,643.88x = 2,268.56 × 981.03
4. Step 4: Simplify right side
   1,643.88x = 2,225,525.42
5. Step 5: Solve for x
   x = 2,225,525.42/1,643.88
6. Step 6: Final answer
   x = 1,353.82