Finding the Fourth Proportional to 2,776.76, 4,165.89 and 1,216.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,776.76 : 4,165.89 = 1,216.90 : x
2. Step 2: Convert to fraction form
   2,776.76/4,165.89 = 1,216.90/x
3. Step 3: Cross multiply
   2,776.76x = 4,165.89 × 1,216.90
4. Step 4: Simplify right side
   2,776.76x = 5,069,471.54
5. Step 5: Solve for x
   x = 5,069,471.54/2,776.76
6. Step 6: Final answer
   x = 1,825.68