Finding the Third Proportional to 320,091 and 699,240

Step by Step Solution

1. Step 1: Write the proportion equation
   320,091 : 699,240 = 699,240 : x
2. Step 2: Convert to fraction form
   320,091/699,240 = 699,240/x
3. Step 3: Cross multiply
   320,091x = 699,240 × 699,240
4. Step 4: Simplify right side
   320,091x = 488,936,577,600
5. Step 5: Solve for x
   x = 488,936,577,600/320,091
6. Step 6: Final answer
   x = 1,527,492.42