Finding the Third Proportional to 138,207.38 and 301,428

Step by Step Solution

1. Step 1: Write the proportion equation
   138,207.38 : 301,428 = 301,428 : x
2. Step 2: Convert to fraction form
   138,207.38/301,428 = 301,428/x
3. Step 3: Cross multiply
   138,207.38x = 301,428 × 301,428
4. Step 4: Simplify right side
   138,207.38x = 90,858,839,184
5. Step 5: Solve for x
   x = 90,858,839,184/138,207.38
6. Step 6: Final answer
   x = 657,409.48