Finding the Third Proportional to 276,320 and 426,690

Step by Step Solution

1. Step 1: Write the proportion equation
   276,320 : 426,690 = 426,690 : x
2. Step 2: Convert to fraction form
   276,320/426,690 = 426,690/x
3. Step 3: Cross multiply
   276,320x = 426,690 × 426,690
4. Step 4: Simplify right side
   276,320x = 182,064,356,100
5. Step 5: Solve for x
   x = 182,064,356,100/276,320
6. Step 6: Final answer
   x = 658,889.53