Finding the Third Proportional to 186,256 and 390,760

Step by Step Solution

1. Step 1: Write the proportion equation
   186,256 : 390,760 = 390,760 : x
2. Step 2: Convert to fraction form
   186,256/390,760 = 390,760/x
3. Step 3: Cross multiply
   186,256x = 390,760 × 390,760
4. Step 4: Simplify right side
   186,256x = 152,693,377,600
5. Step 5: Solve for x
   x = 152,693,377,600/186,256
6. Step 6: Final answer
   x = 819,803.81