Finding the Third Proportional to 148,634 and 317,428

Step by Step Solution

1. Step 1: Write the proportion equation
   148,634 : 317,428 = 317,428 : x
2. Step 2: Convert to fraction form
   148,634/317,428 = 317,428/x
3. Step 3: Cross multiply
   148,634x = 317,428 × 317,428
4. Step 4: Simplify right side
   148,634x = 100,760,535,184
5. Step 5: Solve for x
   x = 100,760,535,184/148,634
6. Step 6: Final answer
   x = 677,910.41