Finding the Fourth Proportional to 2,167.16, 3,249.72 and 780.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.16 : 3,249.72 = 780.17 : x
2. Step 2: Convert to fraction form
   2,167.16/3,249.72 = 780.17/x
3. Step 3: Cross multiply
   2,167.16x = 3,249.72 × 780.17
4. Step 4: Simplify right side
   2,167.16x = 2,535,317.80
5. Step 5: Solve for x
   x = 2,535,317.80/2,167.16
6. Step 6: Final answer
   x = 1,169.88