Finding the Third Proportional to 290,801 and 426,616.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,801 : 426,616.50 = 426,616.50 : x
2. Step 2: Convert to fraction form
   290,801/426,616.50 = 426,616.50/x
3. Step 3: Cross multiply
   290,801x = 426,616.50 × 426,616.50
4. Step 4: Simplify right side
   290,801x = 182,001,638,072.25
5. Step 5: Solve for x
   x = 182,001,638,072.25/290,801
6. Step 6: Final answer
   x = 625,863.18