Finding the Third Proportional to 291,212.50 and 636,305

Step by Step Solution

1. Step 1: Write the proportion equation
   291,212.50 : 636,305 = 636,305 : x
2. Step 2: Convert to fraction form
   291,212.50/636,305 = 636,305/x
3. Step 3: Cross multiply
   291,212.50x = 636,305 × 636,305
4. Step 4: Simplify right side
   291,212.50x = 404,884,053,025
5. Step 5: Solve for x
   x = 404,884,053,025/291,212.50
6. Step 6: Final answer
   x = 1,390,338.85