Finding the Third Proportional to 9,120.50 and 18,872.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120.50 : 18,872.50 = 18,872.50 : x
2. Step 2: Convert to fraction form
   9,120.50/18,872.50 = 18,872.50/x
3. Step 3: Cross multiply
   9,120.50x = 18,872.50 × 18,872.50
4. Step 4: Simplify right side
   9,120.50x = 356,171,256.25
5. Step 5: Solve for x
   x = 356,171,256.25/9,120.50
6. Step 6: Final answer
   x = 39,051.72