Finding the Fourth Proportional to 11,781.25, 17,676.42 and 3,990.04

Step by Step Solution

1. Step 1: Write the proportion equation
   11,781.25 : 17,676.42 = 3,990.04 : x
2. Step 2: Convert to fraction form
   11,781.25/17,676.42 = 3,990.04/x
3. Step 3: Cross multiply
   11,781.25x = 17,676.42 × 3,990.04
4. Step 4: Simplify right side
   11,781.25x = 70,529,622.86
5. Step 5: Solve for x
   x = 70,529,622.86/11,781.25
6. Step 6: Final answer
   x = 5,986.60