Finding the Fourth Proportional to 2,639.78, 3,642.89 and 1,460.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.78 : 3,642.89 = 1,460.85 : x
2. Step 2: Convert to fraction form
   2,639.78/3,642.89 = 1,460.85/x
3. Step 3: Cross multiply
   2,639.78x = 3,642.89 × 1,460.85
4. Step 4: Simplify right side
   2,639.78x = 5,321,711.31
5. Step 5: Solve for x
   x = 5,321,711.31/2,639.78
6. Step 6: Final answer
   x = 2,015.97