Finding the Third Proportional to 642,336 and 1,399,060

Step by Step Solution

1. Step 1: Write the proportion equation
   642,336 : 1,399,060 = 1,399,060 : x
2. Step 2: Convert to fraction form
   642,336/1,399,060 = 1,399,060/x
3. Step 3: Cross multiply
   642,336x = 1,399,060 × 1,399,060
4. Step 4: Simplify right side
   642,336x = 1,957,368,883,600
5. Step 5: Solve for x
   x = 1,957,368,883,600/642,336
6. Step 6: Final answer
   x = 3,047,266.36