Finding the Third Proportional to 145,214 and 318,477.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,214 : 318,477.50 = 318,477.50 : x
2. Step 2: Convert to fraction form
   145,214/318,477.50 = 318,477.50/x
3. Step 3: Cross multiply
   145,214x = 318,477.50 × 318,477.50
4. Step 4: Simplify right side
   145,214x = 101,427,918,006.25
5. Step 5: Solve for x
   x = 101,427,918,006.25/145,214
6. Step 6: Final answer
   x = 698,472.03