Finding the Fourth Proportional to 12,758.81, 17,604.45 and 7,722.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,758.81 : 17,604.45 = 7,722.05 : x
2. Step 2: Convert to fraction form
   12,758.81/17,604.45 = 7,722.05/x
3. Step 3: Cross multiply
   12,758.81x = 17,604.45 × 7,722.05
4. Step 4: Simplify right side
   12,758.81x = 135,942,355.10
5. Step 5: Solve for x
   x = 135,942,355.10/12,758.81
6. Step 6: Final answer
   x = 10,654.79