Finding the Fourth Proportional to 6,976.72, 9,627.32 and 3,991.87

Step by Step Solution

1. Step 1: Write the proportion equation
   6,976.72 : 9,627.32 = 3,991.87 : x
2. Step 2: Convert to fraction form
   6,976.72/9,627.32 = 3,991.87/x
3. Step 3: Cross multiply
   6,976.72x = 9,627.32 × 3,991.87
4. Step 4: Simplify right side
   6,976.72x = 38,431,009.89
5. Step 5: Solve for x
   x = 38,431,009.89/6,976.72
6. Step 6: Final answer
   x = 5,508.46