Finding the Third Proportional to 140,391 and 300,078

Step by Step Solution

1. Step 1: Write the proportion equation
   140,391 : 300,078 = 300,078 : x
2. Step 2: Convert to fraction form
   140,391/300,078 = 300,078/x
3. Step 3: Cross multiply
   140,391x = 300,078 × 300,078
4. Step 4: Simplify right side
   140,391x = 90,046,806,084
5. Step 5: Solve for x
   x = 90,046,806,084/140,391
6. Step 6: Final answer
   x = 641,400.13