Finding the Third Proportional to 145,573.50 and 308,644.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,573.50 : 308,644.50 = 308,644.50 : x
2. Step 2: Convert to fraction form
   145,573.50/308,644.50 = 308,644.50/x
3. Step 3: Cross multiply
   145,573.50x = 308,644.50 × 308,644.50
4. Step 4: Simplify right side
   145,573.50x = 95,261,427,380.25
5. Step 5: Solve for x
   x = 95,261,427,380.25/145,573.50
6. Step 6: Final answer
   x = 654,387.15