Finding the Third Proportional to 320,287.50 and 470,790

Step by Step Solution

1. Step 1: Write the proportion equation
   320,287.50 : 470,790 = 470,790 : x
2. Step 2: Convert to fraction form
   320,287.50/470,790 = 470,790/x
3. Step 3: Cross multiply
   320,287.50x = 470,790 × 470,790
4. Step 4: Simplify right side
   320,287.50x = 221,643,224,100
5. Step 5: Solve for x
   x = 221,643,224,100/320,287.50
6. Step 6: Final answer
   x = 692,013.34