Finding the Third Proportional to 190,390 and 418,150

Step by Step Solution

1. Step 1: Write the proportion equation
   190,390 : 418,150 = 418,150 : x
2. Step 2: Convert to fraction form
   190,390/418,150 = 418,150/x
3. Step 3: Cross multiply
   190,390x = 418,150 × 418,150
4. Step 4: Simplify right side
   190,390x = 174,849,422,500
5. Step 5: Solve for x
   x = 174,849,422,500/190,390
6. Step 6: Final answer
   x = 918,375.03