Finding the Third Proportional to 311,728.50 and 485,838

Step by Step Solution

1. Step 1: Write the proportion equation
   311,728.50 : 485,838 = 485,838 : x
2. Step 2: Convert to fraction form
   311,728.50/485,838 = 485,838/x
3. Step 3: Cross multiply
   311,728.50x = 485,838 × 485,838
4. Step 4: Simplify right side
   311,728.50x = 236,038,562,244
5. Step 5: Solve for x
   x = 236,038,562,244/311,728.50
6. Step 6: Final answer
   x = 757,192.76