Finding the Third Proportional to 231,635 and 345,428

Step by Step Solution

1. Step 1: Write the proportion equation
   231,635 : 345,428 = 345,428 : x
2. Step 2: Convert to fraction form
   231,635/345,428 = 345,428/x
3. Step 3: Cross multiply
   231,635x = 345,428 × 345,428
4. Step 4: Simplify right side
   231,635x = 119,320,503,184
5. Step 5: Solve for x
   x = 119,320,503,184/231,635
6. Step 6: Final answer
   x = 515,122.94