Finding the Third Proportional to 781.50 and 1,216

Step by Step Solution

1. Step 1: Write the proportion equation
   781.50 : 1,216 = 1,216 : x
2. Step 2: Convert to fraction form
   781.50/1,216 = 1,216/x
3. Step 3: Cross multiply
   781.50x = 1,216 × 1,216
4. Step 4: Simplify right side
   781.50x = 1,478,656
5. Step 5: Solve for x
   x = 1,478,656/781.50
6. Step 6: Final answer
   x = 1,892.07