Finding the Third Proportional to 332,640 and 521,111.25

Step by Step Solution

1. Step 1: Write the proportion equation
   332,640 : 521,111.25 = 521,111.25 : x
2. Step 2: Convert to fraction form
   332,640/521,111.25 = 521,111.25/x
3. Step 3: Cross multiply
   332,640x = 521,111.25 × 521,111.25
4. Step 4: Simplify right side
   332,640x = 271,556,934,876.56
5. Step 5: Solve for x
   x = 271,556,934,876.56/332,640
6. Step 6: Final answer
   x = 816,368.85