Finding the Third Proportional to 311,416 and 443,790

Step by Step Solution

1. Step 1: Write the proportion equation
   311,416 : 443,790 = 443,790 : x
2. Step 2: Convert to fraction form
   311,416/443,790 = 443,790/x
3. Step 3: Cross multiply
   311,416x = 443,790 × 443,790
4. Step 4: Simplify right side
   311,416x = 196,949,564,100
5. Step 5: Solve for x
   x = 196,949,564,100/311,416
6. Step 6: Final answer
   x = 632,432.39