Finding the Third Proportional to 199,872 and 429,390

Step by Step Solution

1. Step 1: Write the proportion equation
   199,872 : 429,390 = 429,390 : x
2. Step 2: Convert to fraction form
   199,872/429,390 = 429,390/x
3. Step 3: Cross multiply
   199,872x = 429,390 × 429,390
4. Step 4: Simplify right side
   199,872x = 184,375,772,100
5. Step 5: Solve for x
   x = 184,375,772,100/199,872
6. Step 6: Final answer
   x = 922,469.24