Finding the Third Proportional to 148,860 and 321,042

Step by Step Solution

1. Step 1: Write the proportion equation
   148,860 : 321,042 = 321,042 : x
2. Step 2: Convert to fraction form
   148,860/321,042 = 321,042/x
3. Step 3: Cross multiply
   148,860x = 321,042 × 321,042
4. Step 4: Simplify right side
   148,860x = 103,067,965,764
5. Step 5: Solve for x
   x = 103,067,965,764/148,860
6. Step 6: Final answer
   x = 692,381.87