Finding the Fourth Proportional to 2,639.25, 3,642.17 and 1,591.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.25 : 3,642.17 = 1,591.11 : x
2. Step 2: Convert to fraction form
   2,639.25/3,642.17 = 1,591.11/x
3. Step 3: Cross multiply
   2,639.25x = 3,642.17 × 1,591.11
4. Step 4: Simplify right side
   2,639.25x = 5,795,085.15
5. Step 5: Solve for x
   x = 5,795,085.15/2,639.25
6. Step 6: Final answer
   x = 2,195.73