Finding the Fourth Proportional to 2,167.83, 3,249.90 and 780.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.83 : 3,249.90 = 780.39 : x
2. Step 2: Convert to fraction form
   2,167.83/3,249.90 = 780.39/x
3. Step 3: Cross multiply
   2,167.83x = 3,249.90 × 780.39
4. Step 4: Simplify right side
   2,167.83x = 2,536,189.46
5. Step 5: Solve for x
   x = 2,536,189.46/2,167.83
6. Step 6: Final answer
   x = 1,169.92