Finding the Third Proportional to 642,343.50 and 1,383,345

Step by Step Solution

1. Step 1: Write the proportion equation
   642,343.50 : 1,383,345 = 1,383,345 : x
2. Step 2: Convert to fraction form
   642,343.50/1,383,345 = 1,383,345/x
3. Step 3: Cross multiply
   642,343.50x = 1,383,345 × 1,383,345
4. Step 4: Simplify right side
   642,343.50x = 1,913,643,389,025
5. Step 5: Solve for x
   x = 1,913,643,389,025/642,343.50
6. Step 6: Final answer
   x = 2,979,158.95