Finding the Third Proportional to 276,718.50 and 423,108

Step by Step Solution

1. Step 1: Write the proportion equation
   276,718.50 : 423,108 = 423,108 : x
2. Step 2: Convert to fraction form
   276,718.50/423,108 = 423,108/x
3. Step 3: Cross multiply
   276,718.50x = 423,108 × 423,108
4. Step 4: Simplify right side
   276,718.50x = 179,020,379,664
5. Step 5: Solve for x
   x = 179,020,379,664/276,718.50
6. Step 6: Final answer
   x = 646,940.41