Finding the Third Proportional to 299,700 and 642,046.50

Step by Step Solution

1. Step 1: Write the proportion equation
   299,700 : 642,046.50 = 642,046.50 : x
2. Step 2: Convert to fraction form
   299,700/642,046.50 = 642,046.50/x
3. Step 3: Cross multiply
   299,700x = 642,046.50 × 642,046.50
4. Step 4: Simplify right side
   299,700x = 412,223,708,162.25
5. Step 5: Solve for x
   x = 412,223,708,162.25/299,700
6. Step 6: Final answer
   x = 1,375,454.48