Finding the Fourth Proportional to 11,777.31, 17,665.52 and 3,986.13

Step by Step Solution

1. Step 1: Write the proportion equation
   11,777.31 : 17,665.52 = 3,986.13 : x
2. Step 2: Convert to fraction form
   11,777.31/17,665.52 = 3,986.13/x
3. Step 3: Cross multiply
   11,777.31x = 17,665.52 × 3,986.13
4. Step 4: Simplify right side
   11,777.31x = 70,417,039.31
5. Step 5: Solve for x
   x = 70,417,039.31/11,777.31
6. Step 6: Final answer
   x = 5,979.04