Finding the Fourth Proportional to 3,636.72, 5,427.78 and 3,549.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,636.72 : 5,427.78 = 3,549.20 : x
2. Step 2: Convert to fraction form
   3,636.72/5,427.78 = 3,549.20/x
3. Step 3: Cross multiply
   3,636.72x = 5,427.78 × 3,549.20
4. Step 4: Simplify right side
   3,636.72x = 19,264,276.78
5. Step 5: Solve for x
   x = 19,264,276.78/3,636.72
6. Step 6: Final answer
   x = 5,297.16