Finding the Third Proportional to 666,309 and 949,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   666,309 : 949,621.50 = 949,621.50 : x
2. Step 2: Convert to fraction form
   666,309/949,621.50 = 949,621.50/x
3. Step 3: Cross multiply
   666,309x = 949,621.50 × 949,621.50
4. Step 4: Simplify right side
   666,309x = 901,780,993,262.25
5. Step 5: Solve for x
   x = 901,780,993,262.25/666,309
6. Step 6: Final answer
   x = 1,353,397.59