Finding the Third Proportional to 145,570 and 318,294.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,570 : 318,294.50 = 318,294.50 : x
2. Step 2: Convert to fraction form
   145,570/318,294.50 = 318,294.50/x
3. Step 3: Cross multiply
   145,570x = 318,294.50 × 318,294.50
4. Step 4: Simplify right side
   145,570x = 101,311,388,730.25
5. Step 5: Solve for x
   x = 101,311,388,730.25/145,570
6. Step 6: Final answer
   x = 695,963.38