Finding the Third Proportional to 445,517 and 643,695.50

Step by Step Solution

1. Step 1: Write the proportion equation
   445,517 : 643,695.50 = 643,695.50 : x
2. Step 2: Convert to fraction form
   445,517/643,695.50 = 643,695.50/x
3. Step 3: Cross multiply
   445,517x = 643,695.50 × 643,695.50
4. Step 4: Simplify right side
   445,517x = 414,343,896,720.25
5. Step 5: Solve for x
   x = 414,343,896,720.25/445,517
6. Step 6: Final answer
   x = 930,029.37