Finding the Fourth Proportional to 1,643.31, 2,464.90 and 912.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.31 : 2,464.90 = 912.42 : x
2. Step 2: Convert to fraction form
   1,643.31/2,464.90 = 912.42/x
3. Step 3: Cross multiply
   1,643.31x = 2,464.90 × 912.42
4. Step 4: Simplify right side
   1,643.31x = 2,249,021.78
5. Step 5: Solve for x
   x = 2,249,021.78/1,643.31
6. Step 6: Final answer
   x = 1,368.59