Finding the Third Proportional to 145,300.50 and 318,640.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,300.50 : 318,640.50 = 318,640.50 : x
2. Step 2: Convert to fraction form
   145,300.50/318,640.50 = 318,640.50/x
3. Step 3: Cross multiply
   145,300.50x = 318,640.50 × 318,640.50
4. Step 4: Simplify right side
   145,300.50x = 101,531,768,240.25
5. Step 5: Solve for x
   x = 101,531,768,240.25/145,300.50
6. Step 6: Final answer
   x = 698,770.95