Finding the Third Proportional to 311,450 and 666,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,450 : 666,086.50 = 666,086.50 : x
2. Step 2: Convert to fraction form
   311,450/666,086.50 = 666,086.50/x
3. Step 3: Cross multiply
   311,450x = 666,086.50 × 666,086.50
4. Step 4: Simplify right side
   311,450x = 443,671,225,482.25
5. Step 5: Solve for x
   x = 443,671,225,482.25/311,450
6. Step 6: Final answer
   x = 1,424,534.36