Finding the Third Proportional to 290,910 and 617,034

Step by Step Solution

1. Step 1: Write the proportion equation
   290,910 : 617,034 = 617,034 : x
2. Step 2: Convert to fraction form
   290,910/617,034 = 617,034/x
3. Step 3: Cross multiply
   290,910x = 617,034 × 617,034
4. Step 4: Simplify right side
   290,910x = 380,730,957,156
5. Step 5: Solve for x
   x = 380,730,957,156/290,910
6. Step 6: Final answer
   x = 1,308,758.58