Finding the Third Proportional to 148,300 and 319,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   148,300 : 319,928.50 = 319,928.50 : x
2. Step 2: Convert to fraction form
   148,300/319,928.50 = 319,928.50/x
3. Step 3: Cross multiply
   148,300x = 319,928.50 × 319,928.50
4. Step 4: Simplify right side
   148,300x = 102,354,245,112.25
5. Step 5: Solve for x
   x = 102,354,245,112.25/148,300
6. Step 6: Final answer
   x = 690,183.72