Finding the Fourth Proportional to 2,643.02, 3,965.13 and 1,409.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.02 : 3,965.13 = 1,409.78 : x
2. Step 2: Convert to fraction form
   2,643.02/3,965.13 = 1,409.78/x
3. Step 3: Cross multiply
   2,643.02x = 3,965.13 × 1,409.78
4. Step 4: Simplify right side
   2,643.02x = 5,589,941.15
5. Step 5: Solve for x
   x = 5,589,941.15/2,643.02
6. Step 6: Final answer
   x = 2,114.99