Finding the Fourth Proportional to 11,776.86, 17,668.62 and 3,986.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,776.86 : 17,668.62 = 3,986.28 : x
2. Step 2: Convert to fraction form
   11,776.86/17,668.62 = 3,986.28/x
3. Step 3: Cross multiply
   11,776.86x = 17,668.62 × 3,986.28
4. Step 4: Simplify right side
   11,776.86x = 70,432,066.53
5. Step 5: Solve for x
   x = 70,432,066.53/11,776.86
6. Step 6: Final answer
   x = 5,980.55