Finding the Fourth Proportional to 3,976.29, 5,968.72 and 2,991.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,976.29 : 5,968.72 = 2,991.90 : x
2. Step 2: Convert to fraction form
   3,976.29/5,968.72 = 2,991.90/x
3. Step 3: Cross multiply
   3,976.29x = 5,968.72 × 2,991.90
4. Step 4: Simplify right side
   3,976.29x = 17,857,839.49
5. Step 5: Solve for x
   x = 17,857,839.49/3,976.29
6. Step 6: Final answer
   x = 4,491.08