Finding the Fourth Proportional to 2,640.42, 3,959.64 and 1,079.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.42 : 3,959.64 = 1,079.59 : x
2. Step 2: Convert to fraction form
   2,640.42/3,959.64 = 1,079.59/x
3. Step 3: Cross multiply
   2,640.42x = 3,959.64 × 1,079.59
4. Step 4: Simplify right side
   2,640.42x = 4,274,787.75
5. Step 5: Solve for x
   x = 4,274,787.75/2,640.42
6. Step 6: Final answer
   x = 1,618.98