Finding the Third Proportional to 390,426 and 852,456

Step by Step Solution

1. Step 1: Write the proportion equation
   390,426 : 852,456 = 852,456 : x
2. Step 2: Convert to fraction form
   390,426/852,456 = 852,456/x
3. Step 3: Cross multiply
   390,426x = 852,456 × 852,456
4. Step 4: Simplify right side
   390,426x = 726,681,231,936
5. Step 5: Solve for x
   x = 726,681,231,936/390,426
6. Step 6: Final answer
   x = 1,861,252.15