Finding the Third Proportional to 277,326 and 428,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   277,326 : 428,215.50 = 428,215.50 : x
2. Step 2: Convert to fraction form
   277,326/428,215.50 = 428,215.50/x
3. Step 3: Cross multiply
   277,326x = 428,215.50 × 428,215.50
4. Step 4: Simplify right side
   277,326x = 183,368,514,440.25
5. Step 5: Solve for x
   x = 183,368,514,440.25/277,326
6. Step 6: Final answer
   x = 661,202.03