Finding the Third Proportional to 138,600 and 215,028

Step by Step Solution

1. Step 1: Write the proportion equation
   138,600 : 215,028 = 215,028 : x
2. Step 2: Convert to fraction form
   138,600/215,028 = 215,028/x
3. Step 3: Cross multiply
   138,600x = 215,028 × 215,028
4. Step 4: Simplify right side
   138,600x = 46,237,040,784
5. Step 5: Solve for x
   x = 46,237,040,784/138,600
6. Step 6: Final answer
   x = 333,600.58