Finding the Third Proportional to 311,539.50 and 679,212

Step by Step Solution

1. Step 1: Write the proportion equation
   311,539.50 : 679,212 = 679,212 : x
2. Step 2: Convert to fraction form
   311,539.50/679,212 = 679,212/x
3. Step 3: Cross multiply
   311,539.50x = 679,212 × 679,212
4. Step 4: Simplify right side
   311,539.50x = 461,328,940,944
5. Step 5: Solve for x
   x = 461,328,940,944/311,539.50
6. Step 6: Final answer
   x = 1,480,804.01