Finding the Fourth Proportional to 2,645.87, 3,934.18 and 2,535.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.87 : 3,934.18 = 2,535.15 : x
2. Step 2: Convert to fraction form
   2,645.87/3,934.18 = 2,535.15/x
3. Step 3: Cross multiply
   2,645.87x = 3,934.18 × 2,535.15
4. Step 4: Simplify right side
   2,645.87x = 9,973,704.08
5. Step 5: Solve for x
   x = 9,973,704.08/2,645.87
6. Step 6: Final answer
   x = 3,769.54