Finding the Third Proportional to 12,678.38 and 18,658.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.38 : 18,658.88 = 18,658.88 : x
2. Step 2: Convert to fraction form
   12,678.38/18,658.88 = 18,658.88/x
3. Step 3: Cross multiply
   12,678.38x = 18,658.88 × 18,658.88
4. Step 4: Simplify right side
   12,678.38x = 348,153,616.27
5. Step 5: Solve for x
   x = 348,153,616.27/12,678.38
6. Step 6: Final answer
   x = 27,460.43