Finding the Third Proportional to 208,136 and 490,772

Step by Step Solution

1. Step 1: Write the proportion equation
   208,136 : 490,772 = 490,772 : x
2. Step 2: Convert to fraction form
   208,136/490,772 = 490,772/x
3. Step 3: Cross multiply
   208,136x = 490,772 × 490,772
4. Step 4: Simplify right side
   208,136x = 240,857,155,984
5. Step 5: Solve for x
   x = 240,857,155,984/208,136
6. Step 6: Final answer
   x = 1,157,210.46