Finding the Fourth Proportional to 3,774.48, 5,639.37 and 3,645.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,774.48 : 5,639.37 = 3,645.30 : x
2. Step 2: Convert to fraction form
   3,774.48/5,639.37 = 3,645.30/x
3. Step 3: Cross multiply
   3,774.48x = 5,639.37 × 3,645.30
4. Step 4: Simplify right side
   3,774.48x = 20,557,195.46
5. Step 5: Solve for x
   x = 20,557,195.46/3,774.48
6. Step 6: Final answer
   x = 5,446.36