Finding the Third Proportional to 276,808.50 and 433,665

Step by Step Solution

1. Step 1: Write the proportion equation
   276,808.50 : 433,665 = 433,665 : x
2. Step 2: Convert to fraction form
   276,808.50/433,665 = 433,665/x
3. Step 3: Cross multiply
   276,808.50x = 433,665 × 433,665
4. Step 4: Simplify right side
   276,808.50x = 188,065,332,225
5. Step 5: Solve for x
   x = 188,065,332,225/276,808.50
6. Step 6: Final answer
   x = 679,405.92