Finding the Third Proportional to 356,309.50 and 742,103

Step by Step Solution

1. Step 1: Write the proportion equation
   356,309.50 : 742,103 = 742,103 : x
2. Step 2: Convert to fraction form
   356,309.50/742,103 = 742,103/x
3. Step 3: Cross multiply
   356,309.50x = 742,103 × 742,103
4. Step 4: Simplify right side
   356,309.50x = 550,716,862,609
5. Step 5: Solve for x
   x = 550,716,862,609/356,309.50
6. Step 6: Final answer
   x = 1,545,613.75