Finding the Third Proportional to 9,111.50 and 19,620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.50 : 19,620.50 = 19,620.50 : x
2. Step 2: Convert to fraction form
   9,111.50/19,620.50 = 19,620.50/x
3. Step 3: Cross multiply
   9,111.50x = 19,620.50 × 19,620.50
4. Step 4: Simplify right side
   9,111.50x = 384,964,020.25
5. Step 5: Solve for x
   x = 384,964,020.25/9,111.50
6. Step 6: Final answer
   x = 42,250.35