Finding the Fourth Proportional to 3,487.78, 5,233.83 and 2,561.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,487.78 : 5,233.83 = 2,561.05 : x
2. Step 2: Convert to fraction form
   3,487.78/5,233.83 = 2,561.05/x
3. Step 3: Cross multiply
   3,487.78x = 5,233.83 × 2,561.05
4. Step 4: Simplify right side
   3,487.78x = 13,404,100.32
5. Step 5: Solve for x
   x = 13,404,100.32/3,487.78
6. Step 6: Final answer
   x = 3,843.16