Finding the Third Proportional to 148,912 and 321,150

Step by Step Solution

1. Step 1: Write the proportion equation
   148,912 : 321,150 = 321,150 : x
2. Step 2: Convert to fraction form
   148,912/321,150 = 321,150/x
3. Step 3: Cross multiply
   148,912x = 321,150 × 321,150
4. Step 4: Simplify right side
   148,912x = 103,137,322,500
5. Step 5: Solve for x
   x = 103,137,322,500/148,912
6. Step 6: Final answer
   x = 692,605.85