Finding the Fourth Proportional to 2,639.46, 3,642.83 and 1,645.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.46 : 3,642.83 = 1,645.05 : x
2. Step 2: Convert to fraction form
   2,639.46/3,642.83 = 1,645.05/x
3. Step 3: Cross multiply
   2,639.46x = 3,642.83 × 1,645.05
4. Step 4: Simplify right side
   2,639.46x = 5,992,611.05
5. Step 5: Solve for x
   x = 5,992,611.05/2,639.46
6. Step 6: Final answer
   x = 2,270.40