Finding the Fourth Proportional to 3,990.33, 5,966.50 and 3,641.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.33 : 5,966.50 = 3,641.78 : x
2. Step 2: Convert to fraction form
   3,990.33/5,966.50 = 3,641.78/x
3. Step 3: Cross multiply
   3,990.33x = 5,966.50 × 3,641.78
4. Step 4: Simplify right side
   3,990.33x = 21,728,632.33
5. Step 5: Solve for x
   x = 21,728,632.33/3,990.33
6. Step 6: Final answer
   x = 5,445.32