Finding the Third Proportional to 333,716.50 and 691,090

Step by Step Solution

1. Step 1: Write the proportion equation
   333,716.50 : 691,090 = 691,090 : x
2. Step 2: Convert to fraction form
   333,716.50/691,090 = 691,090/x
3. Step 3: Cross multiply
   333,716.50x = 691,090 × 691,090
4. Step 4: Simplify right side
   333,716.50x = 477,605,388,100
5. Step 5: Solve for x
   x = 477,605,388,100/333,716.50
6. Step 6: Final answer
   x = 1,431,171.03