Finding the Third Proportional to 423,787.50 and 639,622

Step by Step Solution

1. Step 1: Write the proportion equation
   423,787.50 : 639,622 = 639,622 : x
2. Step 2: Convert to fraction form
   423,787.50/639,622 = 639,622/x
3. Step 3: Cross multiply
   423,787.50x = 639,622 × 639,622
4. Step 4: Simplify right side
   423,787.50x = 409,116,302,884
5. Step 5: Solve for x
   x = 409,116,302,884/423,787.50
6. Step 6: Final answer
   x = 965,380.77