Finding the Third Proportional to 439,352 and 643,476

Step by Step Solution

1. Step 1: Write the proportion equation
   439,352 : 643,476 = 643,476 : x
2. Step 2: Convert to fraction form
   439,352/643,476 = 643,476/x
3. Step 3: Cross multiply
   439,352x = 643,476 × 643,476
4. Step 4: Simplify right side
   439,352x = 414,061,362,576
5. Step 5: Solve for x
   x = 414,061,362,576/439,352
6. Step 6: Final answer
   x = 942,436.50