Finding the Third Proportional to 138,426 and 297,451.50

Step by Step Solution

1. Step 1: Write the proportion equation
   138,426 : 297,451.50 = 297,451.50 : x
2. Step 2: Convert to fraction form
   138,426/297,451.50 = 297,451.50/x
3. Step 3: Cross multiply
   138,426x = 297,451.50 × 297,451.50
4. Step 4: Simplify right side
   138,426x = 88,477,394,852.25
5. Step 5: Solve for x
   x = 88,477,394,852.25/138,426
6. Step 6: Final answer
   x = 639,167.46