Finding the Fourth Proportional to 12,757.15, 17,605.29 and 7,722.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,757.15 : 17,605.29 = 7,722.28 : x
2. Step 2: Convert to fraction form
   12,757.15/17,605.29 = 7,722.28/x
3. Step 3: Cross multiply
   12,757.15x = 17,605.29 × 7,722.28
4. Step 4: Simplify right side
   12,757.15x = 135,952,978.86
5. Step 5: Solve for x
   x = 135,952,978.86/12,757.15
6. Step 6: Final answer
   x = 10,657.00