Finding the Third Proportional to 17,415 and 18,913.50

Step by Step Solution

1. Step 1: Write the proportion equation
   17,415 : 18,913.50 = 18,913.50 : x
2. Step 2: Convert to fraction form
   17,415/18,913.50 = 18,913.50/x
3. Step 3: Cross multiply
   17,415x = 18,913.50 × 18,913.50
4. Step 4: Simplify right side
   17,415x = 357,720,482.25
5. Step 5: Solve for x
   x = 357,720,482.25/17,415
6. Step 6: Final answer
   x = 20,540.94