Finding the Third Proportional to 153,085.50 and 324,702

Step by Step Solution

1. Step 1: Write the proportion equation
   153,085.50 : 324,702 = 324,702 : x
2. Step 2: Convert to fraction form
   153,085.50/324,702 = 324,702/x
3. Step 3: Cross multiply
   153,085.50x = 324,702 × 324,702
4. Step 4: Simplify right side
   153,085.50x = 105,431,388,804
5. Step 5: Solve for x
   x = 105,431,388,804/153,085.50
6. Step 6: Final answer
   x = 688,709.18