Finding the Fourth Proportional to 11,665.12, 17,491.44 and 3,871.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.12 : 17,491.44 = 3,871.12 : x
2. Step 2: Convert to fraction form
   11,665.12/17,491.44 = 3,871.12/x
3. Step 3: Cross multiply
   11,665.12x = 17,491.44 × 3,871.12
4. Step 4: Simplify right side
   11,665.12x = 67,711,463.21
5. Step 5: Solve for x
   x = 67,711,463.21/11,665.12
6. Step 6: Final answer
   x = 5,804.61