Finding the Fourth Proportional to 12,808.35, 17,672.85 and 7,775.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.35 : 17,672.85 = 7,775.22 : x
2. Step 2: Convert to fraction form
   12,808.35/17,672.85 = 7,775.22/x
3. Step 3: Cross multiply
   12,808.35x = 17,672.85 × 7,775.22
4. Step 4: Simplify right side
   12,808.35x = 137,410,296.78
5. Step 5: Solve for x
   x = 137,410,296.78/12,808.35
6. Step 6: Final answer
   x = 10,728.18