Finding the Third Proportional to 153,189.50 and 324,043

Step by Step Solution

1. Step 1: Write the proportion equation
   153,189.50 : 324,043 = 324,043 : x
2. Step 2: Convert to fraction form
   153,189.50/324,043 = 324,043/x
3. Step 3: Cross multiply
   153,189.50x = 324,043 × 324,043
4. Step 4: Simplify right side
   153,189.50x = 105,003,865,849
5. Step 5: Solve for x
   x = 105,003,865,849/153,189.50
6. Step 6: Final answer
   x = 685,450.80