Finding the Third Proportional to 643,420 and 1,392,752

Step by Step Solution

1. Step 1: Write the proportion equation
   643,420 : 1,392,752 = 1,392,752 : x
2. Step 2: Convert to fraction form
   643,420/1,392,752 = 1,392,752/x
3. Step 3: Cross multiply
   643,420x = 1,392,752 × 1,392,752
4. Step 4: Simplify right side
   643,420x = 1,939,758,133,504
5. Step 5: Solve for x
   x = 1,939,758,133,504/643,420
6. Step 6: Final answer
   x = 3,014,761.95