Finding the Third Proportional to 145,048.50 and 315,004.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,048.50 : 315,004.50 = 315,004.50 : x
2. Step 2: Convert to fraction form
   145,048.50/315,004.50 = 315,004.50/x
3. Step 3: Cross multiply
   145,048.50x = 315,004.50 × 315,004.50
4. Step 4: Simplify right side
   145,048.50x = 99,227,835,020.25
5. Step 5: Solve for x
   x = 99,227,835,020.25/145,048.50
6. Step 6: Final answer
   x = 684,101.08