Finding the Third Proportional to 208,136 and 309,900

Step by Step Solution

1. Step 1: Write the proportion equation
   208,136 : 309,900 = 309,900 : x
2. Step 2: Convert to fraction form
   208,136/309,900 = 309,900/x
3. Step 3: Cross multiply
   208,136x = 309,900 × 309,900
4. Step 4: Simplify right side
   208,136x = 96,038,010,000
5. Step 5: Solve for x
   x = 96,038,010,000/208,136
6. Step 6: Final answer
   x = 461,419.50