Finding the Fourth Proportional to 12,808.56, 17,676.98 and 7,774.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.56 : 17,676.98 = 7,774.07 : x
2. Step 2: Convert to fraction form
   12,808.56/17,676.98 = 7,774.07/x
3. Step 3: Cross multiply
   12,808.56x = 17,676.98 × 7,774.07
4. Step 4: Simplify right side
   12,808.56x = 137,421,952.65
5. Step 5: Solve for x
   x = 137,421,952.65/12,808.56
6. Step 6: Final answer
   x = 10,728.92