Finding the Fourth Proportional to 12,810.06, 17,679.05 and 7,775.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,810.06 : 17,679.05 = 7,775.57 : x
2. Step 2: Convert to fraction form
   12,810.06/17,679.05 = 7,775.57/x
3. Step 3: Cross multiply
   12,810.06x = 17,679.05 × 7,775.57
4. Step 4: Simplify right side
   12,810.06x = 137,464,563.54
5. Step 5: Solve for x
   x = 137,464,563.54/12,810.06
6. Step 6: Final answer
   x = 10,730.99