Finding the Fourth Proportional to 2,390.63, 3,297.57 and 1,643.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.63 : 3,297.57 = 1,643.29 : x
2. Step 2: Convert to fraction form
   2,390.63/3,297.57 = 1,643.29/x
3. Step 3: Cross multiply
   2,390.63x = 3,297.57 × 1,643.29
4. Step 4: Simplify right side
   2,390.63x = 5,418,847.32
5. Step 5: Solve for x
   x = 5,418,847.32/2,390.63
6. Step 6: Final answer
   x = 2,266.71