Finding the Fourth Proportional to 2,577.78, 3,556.52 and 1,515.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,577.78 : 3,556.52 = 1,515.21 : x
2. Step 2: Convert to fraction form
   2,577.78/3,556.52 = 1,515.21/x
3. Step 3: Cross multiply
   2,577.78x = 3,556.52 × 1,515.21
4. Step 4: Simplify right side
   2,577.78x = 5,388,853.10
5. Step 5: Solve for x
   x = 5,388,853.10/2,577.78
6. Step 6: Final answer
   x = 2,090.50