Finding the Third Proportional to 439,353 and 643,477.50

Step by Step Solution

1. Step 1: Write the proportion equation
   439,353 : 643,477.50 = 643,477.50 : x
2. Step 2: Convert to fraction form
   439,353/643,477.50 = 643,477.50/x
3. Step 3: Cross multiply
   439,353x = 643,477.50 × 643,477.50
4. Step 4: Simplify right side
   439,353x = 414,063,293,006.25
5. Step 5: Solve for x
   x = 414,063,293,006.25/439,353
6. Step 6: Final answer
   x = 942,438.75