Finding the Fourth Proportional to 2,643.94, 3,961.79 and 999.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.94 : 3,961.79 = 999.59 : x
2. Step 2: Convert to fraction form
   2,643.94/3,961.79 = 999.59/x
3. Step 3: Cross multiply
   2,643.94x = 3,961.79 × 999.59
4. Step 4: Simplify right side
   2,643.94x = 3,960,140.86
5. Step 5: Solve for x
   x = 3,960,140.86/2,643.94
6. Step 6: Final answer
   x = 1,497.82