Finding the Third Proportional to 120,456 and 190,890

Step by Step Solution

1. Step 1: Write the proportion equation
   120,456 : 190,890 = 190,890 : x
2. Step 2: Convert to fraction form
   120,456/190,890 = 190,890/x
3. Step 3: Cross multiply
   120,456x = 190,890 × 190,890
4. Step 4: Simplify right side
   120,456x = 36,438,992,100
5. Step 5: Solve for x
   x = 36,438,992,100/120,456
6. Step 6: Final answer
   x = 302,508.73