Finding the Fourth Proportional to 8,648.72, 12,970.38 and 5,687

Step by Step Solution

1. Step 1: Write the proportion equation
   8,648.72 : 12,970.38 = 5,687 : x
2. Step 2: Convert to fraction form
   8,648.72/12,970.38 = 5,687/x
3. Step 3: Cross multiply
   8,648.72x = 12,970.38 × 5,687
4. Step 4: Simplify right side
   8,648.72x = 73,762,551.06
5. Step 5: Solve for x
   x = 73,762,551.06/8,648.72
6. Step 6: Final answer
   x = 8,528.72