Finding the Fourth Proportional to 11,782.28, 17,672.96 and 3,991.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,782.28 : 17,672.96 = 3,991.10 : x
2. Step 2: Convert to fraction form
   11,782.28/17,672.96 = 3,991.10/x
3. Step 3: Cross multiply
   11,782.28x = 17,672.96 × 3,991.10
4. Step 4: Simplify right side
   11,782.28x = 70,534,472.27
5. Step 5: Solve for x
   x = 70,534,472.27/11,782.28
6. Step 6: Final answer
   x = 5,986.49