Finding the Third Proportional to 642,906 and 1,400,106

Step by Step Solution

1. Step 1: Write the proportion equation
   642,906 : 1,400,106 = 1,400,106 : x
2. Step 2: Convert to fraction form
   642,906/1,400,106 = 1,400,106/x
3. Step 3: Cross multiply
   642,906x = 1,400,106 × 1,400,106
4. Step 4: Simplify right side
   642,906x = 1,960,296,811,236
5. Step 5: Solve for x
   x = 1,960,296,811,236/642,906
6. Step 6: Final answer
   x = 3,049,118.86