Finding the Fourth Proportional to 2,637.72, 3,641.76 and 1,643.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,637.72 : 3,641.76 = 1,643.40 : x
2. Step 2: Convert to fraction form
   2,637.72/3,641.76 = 1,643.40/x
3. Step 3: Cross multiply
   2,637.72x = 3,641.76 × 1,643.40
4. Step 4: Simplify right side
   2,637.72x = 5,984,868.38
5. Step 5: Solve for x
   x = 5,984,868.38/2,637.72
6. Step 6: Final answer
   x = 2,268.96