Finding the Fourth Proportional to 8,705.28, 12,016.32 and 5,171.52

Step by Step Solution

1. Step 1: Write the proportion equation
   8,705.28 : 12,016.32 = 5,171.52 : x
2. Step 2: Convert to fraction form
   8,705.28/12,016.32 = 5,171.52/x
3. Step 3: Cross multiply
   8,705.28x = 12,016.32 × 5,171.52
4. Step 4: Simplify right side
   8,705.28x = 62,142,639.21
5. Step 5: Solve for x
   x = 62,142,639.21/8,705.28
6. Step 6: Final answer
   x = 7,138.50