Finding the Third Proportional to 154,438.50 and 338,400

Step by Step Solution

1. Step 1: Write the proportion equation
   154,438.50 : 338,400 = 338,400 : x
2. Step 2: Convert to fraction form
   154,438.50/338,400 = 338,400/x
3. Step 3: Cross multiply
   154,438.50x = 338,400 × 338,400
4. Step 4: Simplify right side
   154,438.50x = 114,514,560,000
5. Step 5: Solve for x
   x = 114,514,560,000/154,438.50
6. Step 6: Final answer
   x = 741,489.72