Finding the Third Proportional to 611,412 and 815,436

Step by Step Solution

1. Step 1: Write the proportion equation
   611,412 : 815,436 = 815,436 : x
2. Step 2: Convert to fraction form
   611,412/815,436 = 815,436/x
3. Step 3: Cross multiply
   611,412x = 815,436 × 815,436
4. Step 4: Simplify right side
   611,412x = 664,935,870,096
5. Step 5: Solve for x
   x = 664,935,870,096/611,412
6. Step 6: Final answer
   x = 1,087,541.41