Finding the Fourth Proportional to 12,722.16, 17,552.52 and 7,688.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.16 : 17,552.52 = 7,688.28 : x
2. Step 2: Convert to fraction form
   12,722.16/17,552.52 = 7,688.28/x
3. Step 3: Cross multiply
   12,722.16x = 17,552.52 × 7,688.28
4. Step 4: Simplify right side
   12,722.16x = 134,948,688.47
5. Step 5: Solve for x
   x = 134,948,688.47/12,722.16
6. Step 6: Final answer
   x = 10,607.37