Finding the Fourth Proportional to 12,426.68, 18,642.72 and 7,165.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,426.68 : 18,642.72 = 7,165.10 : x
2. Step 2: Convert to fraction form
   12,426.68/18,642.72 = 7,165.10/x
3. Step 3: Cross multiply
   12,426.68x = 18,642.72 × 7,165.10
4. Step 4: Simplify right side
   12,426.68x = 133,576,953.07
5. Step 5: Solve for x
   x = 133,576,953.07/12,426.68
6. Step 6: Final answer
   x = 10,749.21