Finding the Third Proportional to 4,231 and 9,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   4,231 : 9,111.50 = 9,111.50 : x
2. Step 2: Convert to fraction form
   4,231/9,111.50 = 9,111.50/x
3. Step 3: Cross multiply
   4,231x = 9,111.50 × 9,111.50
4. Step 4: Simplify right side
   4,231x = 83,019,432.25
5. Step 5: Solve for x
   x = 83,019,432.25/4,231
6. Step 6: Final answer
   x = 19,621.70