Finding the Third Proportional to 278,815.50 and 443,136

Step by Step Solution

1. Step 1: Write the proportion equation
   278,815.50 : 443,136 = 443,136 : x
2. Step 2: Convert to fraction form
   278,815.50/443,136 = 443,136/x
3. Step 3: Cross multiply
   278,815.50x = 443,136 × 443,136
4. Step 4: Simplify right side
   278,815.50x = 196,369,514,496
5. Step 5: Solve for x
   x = 196,369,514,496/278,815.50
6. Step 6: Final answer
   x = 704,299.13