Finding the Third Proportional to 155,518.50 and 327,639

Step by Step Solution

1. Step 1: Write the proportion equation
   155,518.50 : 327,639 = 327,639 : x
2. Step 2: Convert to fraction form
   155,518.50/327,639 = 327,639/x
3. Step 3: Cross multiply
   155,518.50x = 327,639 × 327,639
4. Step 4: Simplify right side
   155,518.50x = 107,347,314,321
5. Step 5: Solve for x
   x = 107,347,314,321/155,518.50
6. Step 6: Final answer
   x = 690,254.31