Finding the Third Proportional to 140,245 and 300,415

Step by Step Solution

1. Step 1: Write the proportion equation
   140,245 : 300,415 = 300,415 : x
2. Step 2: Convert to fraction form
   140,245/300,415 = 300,415/x
3. Step 3: Cross multiply
   140,245x = 300,415 × 300,415
4. Step 4: Simplify right side
   140,245x = 90,249,172,225
5. Step 5: Solve for x
   x = 90,249,172,225/140,245
6. Step 6: Final answer
   x = 643,510.80