Finding the Third Proportional to 153,042.50 and 324,611

Step by Step Solution

1. Step 1: Write the proportion equation
   153,042.50 : 324,611 = 324,611 : x
2. Step 2: Convert to fraction form
   153,042.50/324,611 = 324,611/x
3. Step 3: Cross multiply
   153,042.50x = 324,611 × 324,611
4. Step 4: Simplify right side
   153,042.50x = 105,372,301,321
5. Step 5: Solve for x
   x = 105,372,301,321/153,042.50
6. Step 6: Final answer
   x = 688,516.60