Finding the Fourth Proportional to 3,896.61, 5,865.99 and 3,557.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,896.61 : 5,865.99 = 3,557.62 : x
2. Step 2: Convert to fraction form
   3,896.61/5,865.99 = 3,557.62/x
3. Step 3: Cross multiply
   3,896.61x = 5,865.99 × 3,557.62
4. Step 4: Simplify right side
   3,896.61x = 20,868,957.34
5. Step 5: Solve for x
   x = 20,868,957.34/3,896.61
6. Step 6: Final answer
   x = 5,355.68