Finding the Fourth Proportional to 2,556.30, 3,825.72 and 2,145.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.30 : 3,825.72 = 2,145.90 : x
2. Step 2: Convert to fraction form
   2,556.30/3,825.72 = 2,145.90/x
3. Step 3: Cross multiply
   2,556.30x = 3,825.72 × 2,145.90
4. Step 4: Simplify right side
   2,556.30x = 8,209,612.55
5. Step 5: Solve for x
   x = 8,209,612.55/2,556.30
6. Step 6: Final answer
   x = 3,211.52