Finding the Fourth Proportional to 2,575.64, 3,554.60 and 2,155.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,575.64 : 3,554.60 = 2,155.25 : x
2. Step 2: Convert to fraction form
   2,575.64/3,554.60 = 2,155.25/x
3. Step 3: Cross multiply
   2,575.64x = 3,554.60 × 2,155.25
4. Step 4: Simplify right side
   2,575.64x = 7,661,023.10
5. Step 5: Solve for x
   x = 7,661,023.10/2,575.64
6. Step 6: Final answer
   x = 2,974.42