Finding the Third Proportional to 8,918.50 and 19,539.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,918.50 : 19,539.50 = 19,539.50 : x
2. Step 2: Convert to fraction form
   8,918.50/19,539.50 = 19,539.50/x
3. Step 3: Cross multiply
   8,918.50x = 19,539.50 × 19,539.50
4. Step 4: Simplify right side
   8,918.50x = 381,792,060.25
5. Step 5: Solve for x
   x = 381,792,060.25/8,918.50
6. Step 6: Final answer
   x = 42,809.00