Finding the Third Proportional to 285,120 and 443,556

Step by Step Solution

1. Step 1: Write the proportion equation
   285,120 : 443,556 = 443,556 : x
2. Step 2: Convert to fraction form
   285,120/443,556 = 443,556/x
3. Step 3: Cross multiply
   285,120x = 443,556 × 443,556
4. Step 4: Simplify right side
   285,120x = 196,741,925,136
5. Step 5: Solve for x
   x = 196,741,925,136/285,120
6. Step 6: Final answer
   x = 690,032.00