Finding the Fourth Proportional to 3,988.79, 5,976.27 and 3,641.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988.79 : 5,976.27 = 3,641.57 : x
2. Step 2: Convert to fraction form
   3,988.79/5,976.27 = 3,641.57/x
3. Step 3: Cross multiply
   3,988.79x = 5,976.27 × 3,641.57
4. Step 4: Simplify right side
   3,988.79x = 21,762,975.66
5. Step 5: Solve for x
   x = 21,762,975.66/3,988.79
6. Step 6: Final answer
   x = 5,456.04