Finding the Fourth Proportional to 2,578.75, 3,555.35 and 2,106.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.75 : 3,555.35 = 2,106.15 : x
2. Step 2: Convert to fraction form
   2,578.75/3,555.35 = 2,106.15/x
3. Step 3: Cross multiply
   2,578.75x = 3,555.35 × 2,106.15
4. Step 4: Simplify right side
   2,578.75x = 7,488,100.40
5. Step 5: Solve for x
   x = 7,488,100.40/2,578.75
6. Step 6: Final answer
   x = 2,903.77