Finding the Third Proportional to 196,438 and 428,860

Step by Step Solution

1. Step 1: Write the proportion equation
   196,438 : 428,860 = 428,860 : x
2. Step 2: Convert to fraction form
   196,438/428,860 = 428,860/x
3. Step 3: Cross multiply
   196,438x = 428,860 × 428,860
4. Step 4: Simplify right side
   196,438x = 183,920,899,600
5. Step 5: Solve for x
   x = 183,920,899,600/196,438
6. Step 6: Final answer
   x = 936,279.64