Finding the Fourth Proportional to 3,775.76, 5,629.78 and 3,631.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,775.76 : 5,629.78 = 3,631.28 : x
2. Step 2: Convert to fraction form
   3,775.76/5,629.78 = 3,631.28/x
3. Step 3: Cross multiply
   3,775.76x = 5,629.78 × 3,631.28
4. Step 4: Simplify right side
   3,775.76x = 20,443,307.52
5. Step 5: Solve for x
   x = 20,443,307.52/3,775.76
6. Step 6: Final answer
   x = 5,414.36