Finding the Third Proportional to 443,154 and 645,354

Step by Step Solution

1. Step 1: Write the proportion equation
   443,154 : 645,354 = 645,354 : x
2. Step 2: Convert to fraction form
   443,154/645,354 = 645,354/x
3. Step 3: Cross multiply
   443,154x = 645,354 × 645,354
4. Step 4: Simplify right side
   443,154x = 416,481,785,316
5. Step 5: Solve for x
   x = 416,481,785,316/443,154
6. Step 6: Final answer
   x = 939,812.76