Finding the Third Proportional to 276,622.50 and 427,215

Step by Step Solution

1. Step 1: Write the proportion equation
   276,622.50 : 427,215 = 427,215 : x
2. Step 2: Convert to fraction form
   276,622.50/427,215 = 427,215/x
3. Step 3: Cross multiply
   276,622.50x = 427,215 × 427,215
4. Step 4: Simplify right side
   276,622.50x = 182,512,656,225
5. Step 5: Solve for x
   x = 182,512,656,225/276,622.50
6. Step 6: Final answer
   x = 659,789.63