Finding the Fourth Proportional to 3,557.55, 5,328.63 and 2,581.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,557.55 : 5,328.63 = 2,581.50 : x
2. Step 2: Convert to fraction form
   3,557.55/5,328.63 = 2,581.50/x
3. Step 3: Cross multiply
   3,557.55x = 5,328.63 × 2,581.50
4. Step 4: Simplify right side
   3,557.55x = 13,755,858.35
5. Step 5: Solve for x
   x = 13,755,858.35/3,557.55
6. Step 6: Final answer
   x = 3,866.67