Finding the Third Proportional to 656,172 and 861,606

Step by Step Solution

1. Step 1: Write the proportion equation
   656,172 : 861,606 = 861,606 : x
2. Step 2: Convert to fraction form
   656,172/861,606 = 861,606/x
3. Step 3: Cross multiply
   656,172x = 861,606 × 861,606
4. Step 4: Simplify right side
   656,172x = 742,364,899,236
5. Step 5: Solve for x
   x = 742,364,899,236/656,172
6. Step 6: Final answer
   x = 1,131,357.17