Finding the Third Proportional to 140,321 and 300,379

Step by Step Solution

1. Step 1: Write the proportion equation
   140,321 : 300,379 = 300,379 : x
2. Step 2: Convert to fraction form
   140,321/300,379 = 300,379/x
3. Step 3: Cross multiply
   140,321x = 300,379 × 300,379
4. Step 4: Simplify right side
   140,321x = 90,227,543,641
5. Step 5: Solve for x
   x = 90,227,543,641/140,321
6. Step 6: Final answer
   x = 643,008.13