Finding the Fourth Proportional to 2,167.86, 3,249.82 and 780.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.86 : 3,249.82 = 780.87 : x
2. Step 2: Convert to fraction form
   2,167.86/3,249.82 = 780.87/x
3. Step 3: Cross multiply
   2,167.86x = 3,249.82 × 780.87
4. Step 4: Simplify right side
   2,167.86x = 2,537,683.04
5. Step 5: Solve for x
   x = 2,537,683.04/2,167.86
6. Step 6: Final answer
   x = 1,170.59