Finding the Third Proportional to 85,454 and 186,990

Step by Step Solution

1. Step 1: Write the proportion equation
   85,454 : 186,990 = 186,990 : x
2. Step 2: Convert to fraction form
   85,454/186,990 = 186,990/x
3. Step 3: Cross multiply
   85,454x = 186,990 × 186,990
4. Step 4: Simplify right side
   85,454x = 34,965,260,100
5. Step 5: Solve for x
   x = 34,965,260,100/85,454
6. Step 6: Final answer
   x = 409,170.55