Finding the Third Proportional to 212,287.50 and 309,681

Step by Step Solution

1. Step 1: Write the proportion equation
   212,287.50 : 309,681 = 309,681 : x
2. Step 2: Convert to fraction form
   212,287.50/309,681 = 309,681/x
3. Step 3: Cross multiply
   212,287.50x = 309,681 × 309,681
4. Step 4: Simplify right side
   212,287.50x = 95,902,321,761
5. Step 5: Solve for x
   x = 95,902,321,761/212,287.50
6. Step 6: Final answer
   x = 451,756.80