Finding the Third Proportional to 215,256 and 300,940

Step by Step Solution

1. Step 1: Write the proportion equation
   215,256 : 300,940 = 300,940 : x
2. Step 2: Convert to fraction form
   215,256/300,940 = 300,940/x
3. Step 3: Cross multiply
   215,256x = 300,940 × 300,940
4. Step 4: Simplify right side
   215,256x = 90,564,883,600
5. Step 5: Solve for x
   x = 90,564,883,600/215,256
6. Step 6: Final answer
   x = 420,731.05