Finding the Fourth Proportional to 2,167.72, 3,250.81 and 780.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.72 : 3,250.81 = 780.68 : x
2. Step 2: Convert to fraction form
   2,167.72/3,250.81 = 780.68/x
3. Step 3: Cross multiply
   2,167.72x = 3,250.81 × 780.68
4. Step 4: Simplify right side
   2,167.72x = 2,537,859.01
5. Step 5: Solve for x
   x = 2,537,859.01/2,167.72
6. Step 6: Final answer
   x = 1,170.75