Finding the Third Proportional to 153,640.50 and 319,542

Step by Step Solution

1. Step 1: Write the proportion equation
   153,640.50 : 319,542 = 319,542 : x
2. Step 2: Convert to fraction form
   153,640.50/319,542 = 319,542/x
3. Step 3: Cross multiply
   153,640.50x = 319,542 × 319,542
4. Step 4: Simplify right side
   153,640.50x = 102,107,089,764
5. Step 5: Solve for x
   x = 102,107,089,764/153,640.50
6. Step 6: Final answer
   x = 664,584.47