Finding the Third Proportional to 316,636.50 and 646,182

Step by Step Solution

1. Step 1: Write the proportion equation
   316,636.50 : 646,182 = 646,182 : x
2. Step 2: Convert to fraction form
   316,636.50/646,182 = 646,182/x
3. Step 3: Cross multiply
   316,636.50x = 646,182 × 646,182
4. Step 4: Simplify right side
   316,636.50x = 417,551,177,124
5. Step 5: Solve for x
   x = 417,551,177,124/316,636.50
6. Step 6: Final answer
   x = 1,318,708.29