Finding the Fourth Proportional to 2,643.59, 3,963.42 and 1,308.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.59 : 3,963.42 = 1,308.62 : x
2. Step 2: Convert to fraction form
   2,643.59/3,963.42 = 1,308.62/x
3. Step 3: Cross multiply
   2,643.59x = 3,963.42 × 1,308.62
4. Step 4: Simplify right side
   2,643.59x = 5,186,590.86
5. Step 5: Solve for x
   x = 5,186,590.86/2,643.59
6. Step 6: Final answer
   x = 1,961.95