Finding the Third Proportional to 320,046 and 687,551.25

Step by Step Solution

1. Step 1: Write the proportion equation
   320,046 : 687,551.25 = 687,551.25 : x
2. Step 2: Convert to fraction form
   320,046/687,551.25 = 687,551.25/x
3. Step 3: Cross multiply
   320,046x = 687,551.25 × 687,551.25
4. Step 4: Simplify right side
   320,046x = 472,726,721,376.56
5. Step 5: Solve for x
   x = 472,726,721,376.56/320,046
6. Step 6: Final answer
   x = 1,477,058.68