Finding the Fourth Proportional to 2,618.34, 3,920.78 and 1,382.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.34 : 3,920.78 = 1,382.99 : x
2. Step 2: Convert to fraction form
   2,618.34/3,920.78 = 1,382.99/x
3. Step 3: Cross multiply
   2,618.34x = 3,920.78 × 1,382.99
4. Step 4: Simplify right side
   2,618.34x = 5,422,399.53
5. Step 5: Solve for x
   x = 5,422,399.53/2,618.34
6. Step 6: Final answer
   x = 2,070.93