Finding the Fourth Proportional to 12,146.72, 18,216.65 and 7,697.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,146.72 : 18,216.65 = 7,697.79 : x
2. Step 2: Convert to fraction form
   12,146.72/18,216.65 = 7,697.79/x
3. Step 3: Cross multiply
   12,146.72x = 18,216.65 × 7,697.79
4. Step 4: Simplify right side
   12,146.72x = 140,227,907.71
5. Step 5: Solve for x
   x = 140,227,907.71/12,146.72
6. Step 6: Final answer
   x = 11,544.51