Finding the Third Proportional to 423,874.50 and 640,132

Step by Step Solution

1. Step 1: Write the proportion equation
   423,874.50 : 640,132 = 640,132 : x
2. Step 2: Convert to fraction form
   423,874.50/640,132 = 640,132/x
3. Step 3: Cross multiply
   423,874.50x = 640,132 × 640,132
4. Step 4: Simplify right side
   423,874.50x = 409,768,977,424
5. Step 5: Solve for x
   x = 409,768,977,424/423,874.50
6. Step 6: Final answer
   x = 966,722.41