Finding the Third Proportional to 285,316 and 443,558

Step by Step Solution

1. Step 1: Write the proportion equation
   285,316 : 443,558 = 443,558 : x
2. Step 2: Convert to fraction form
   285,316/443,558 = 443,558/x
3. Step 3: Cross multiply
   285,316x = 443,558 × 443,558
4. Step 4: Simplify right side
   285,316x = 196,743,699,364
5. Step 5: Solve for x
   x = 196,743,699,364/285,316
6. Step 6: Final answer
   x = 689,564.20