Finding the Fourth Proportional to 15,687.62, 21,648.83 and 8,517.48

Step by Step Solution

1. Step 1: Write the proportion equation
   15,687.62 : 21,648.83 = 8,517.48 : x
2. Step 2: Convert to fraction form
   15,687.62/21,648.83 = 8,517.48/x
3. Step 3: Cross multiply
   15,687.62x = 21,648.83 × 8,517.48
4. Step 4: Simplify right side
   15,687.62x = 184,393,384.72
5. Step 5: Solve for x
   x = 184,393,384.72/15,687.62
6. Step 6: Final answer
   x = 11,754.07