Finding the Fourth Proportional to 12,756.77, 17,605.55 and 7,722.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,756.77 : 17,605.55 = 7,722.25 : x
2. Step 2: Convert to fraction form
   12,756.77/17,605.55 = 7,722.25/x
3. Step 3: Cross multiply
   12,756.77x = 17,605.55 × 7,722.25
4. Step 4: Simplify right side
   12,756.77x = 135,954,375.86
5. Step 5: Solve for x
   x = 135,954,375.86/12,756.77
6. Step 6: Final answer
   x = 10,657.43