Finding the Third Proportional to 1,317.50 and 1,915

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.50 : 1,915 = 1,915 : x
2. Step 2: Convert to fraction form
   1,317.50/1,915 = 1,915/x
3. Step 3: Cross multiply
   1,317.50x = 1,915 × 1,915
4. Step 4: Simplify right side
   1,317.50x = 3,667,225
5. Step 5: Solve for x
   x = 3,667,225/1,317.50
6. Step 6: Final answer
   x = 2,783.47