Finding the Fourth Proportional to 2,643.98, 3,966.23 and 912.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.98 : 3,966.23 = 912.38 : x
2. Step 2: Convert to fraction form
   2,643.98/3,966.23 = 912.38/x
3. Step 3: Cross multiply
   2,643.98x = 3,966.23 × 912.38
4. Step 4: Simplify right side
   2,643.98x = 3,618,691.38
5. Step 5: Solve for x
   x = 3,618,691.38/2,643.98
6. Step 6: Final answer
   x = 1,368.66