Finding the Fourth Proportional to 3,690.69, 5,531.35 and 3,651.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,690.69 : 5,531.35 = 3,651.63 : x
2. Step 2: Convert to fraction form
   3,690.69/5,531.35 = 3,651.63/x
3. Step 3: Cross multiply
   3,690.69x = 5,531.35 × 3,651.63
4. Step 4: Simplify right side
   3,690.69x = 20,198,443.60
5. Step 5: Solve for x
   x = 20,198,443.60/3,690.69
6. Step 6: Final answer
   x = 5,472.81