Finding the Fourth Proportional to 20,786.12, 31,175.42 and 5,991.40

Step by Step Solution

1. Step 1: Write the proportion equation
   20,786.12 : 31,175.42 = 5,991.40 : x
2. Step 2: Convert to fraction form
   20,786.12/31,175.42 = 5,991.40/x
3. Step 3: Cross multiply
   20,786.12x = 31,175.42 × 5,991.40
4. Step 4: Simplify right side
   20,786.12x = 186,784,411.39
5. Step 5: Solve for x
   x = 186,784,411.39/20,786.12
6. Step 6: Final answer
   x = 8,986.02