Finding the Third Proportional to 290,878 and 426,738

Step by Step Solution

1. Step 1: Write the proportion equation
   290,878 : 426,738 = 426,738 : x
2. Step 2: Convert to fraction form
   290,878/426,738 = 426,738/x
3. Step 3: Cross multiply
   290,878x = 426,738 × 426,738
4. Step 4: Simplify right side
   290,878x = 182,105,320,644
5. Step 5: Solve for x
   x = 182,105,320,644/290,878
6. Step 6: Final answer
   x = 626,053.95