Finding the Third Proportional to 231,316 and 345,055

Step by Step Solution

1. Step 1: Write the proportion equation
   231,316 : 345,055 = 345,055 : x
2. Step 2: Convert to fraction form
   231,316/345,055 = 345,055/x
3. Step 3: Cross multiply
   231,316x = 345,055 × 345,055
4. Step 4: Simplify right side
   231,316x = 119,062,953,025
5. Step 5: Solve for x
   x = 119,062,953,025/231,316
6. Step 6: Final answer
   x = 514,719.92