Finding the Third Proportional to 290,298 and 426,906

Step by Step Solution

1. Step 1: Write the proportion equation
   290,298 : 426,906 = 426,906 : x
2. Step 2: Convert to fraction form
   290,298/426,906 = 426,906/x
3. Step 3: Cross multiply
   290,298x = 426,906 × 426,906
4. Step 4: Simplify right side
   290,298x = 182,248,732,836
5. Step 5: Solve for x
   x = 182,248,732,836/290,298
6. Step 6: Final answer
   x = 627,798.79