Finding the Third Proportional to 90,423 and 196,128

Step by Step Solution

1. Step 1: Write the proportion equation
   90,423 : 196,128 = 196,128 : x
2. Step 2: Convert to fraction form
   90,423/196,128 = 196,128/x
3. Step 3: Cross multiply
   90,423x = 196,128 × 196,128
4. Step 4: Simplify right side
   90,423x = 38,466,192,384
5. Step 5: Solve for x
   x = 38,466,192,384/90,423
6. Step 6: Final answer
   x = 425,402.74