Finding the Third Proportional to 148,276.50 and 308,839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   148,276.50 : 308,839.50 = 308,839.50 : x
2. Step 2: Convert to fraction form
   148,276.50/308,839.50 = 308,839.50/x
3. Step 3: Cross multiply
   148,276.50x = 308,839.50 × 308,839.50
4. Step 4: Simplify right side
   148,276.50x = 95,381,836,760.25
5. Step 5: Solve for x
   x = 95,381,836,760.25/148,276.50
6. Step 6: Final answer
   x = 643,270.09