Finding the Fourth Proportional to 11,384.17, 17,078.31 and 5,147.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,384.17 : 17,078.31 = 5,147.12 : x
2. Step 2: Convert to fraction form
   11,384.17/17,078.31 = 5,147.12/x
3. Step 3: Cross multiply
   11,384.17x = 17,078.31 × 5,147.12
4. Step 4: Simplify right side
   11,384.17x = 87,904,057.60
5. Step 5: Solve for x
   x = 87,904,057.60/11,384.17
6. Step 6: Final answer
   x = 7,721.61