Finding the Fourth Proportional to 11,783.16, 17,674.28 and 3,991.98

Step by Step Solution

1. Step 1: Write the proportion equation
   11,783.16 : 17,674.28 = 3,991.98 : x
2. Step 2: Convert to fraction form
   11,783.16/17,674.28 = 3,991.98/x
3. Step 3: Cross multiply
   11,783.16x = 17,674.28 × 3,991.98
4. Step 4: Simplify right side
   11,783.16x = 70,555,372.27
5. Step 5: Solve for x
   x = 70,555,372.27/11,783.16
6. Step 6: Final answer
   x = 5,987.81