Finding the Fourth Proportional to 2,178.42, 3,266.61 and 790.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.42 : 3,266.61 = 790.79 : x
2. Step 2: Convert to fraction form
   2,178.42/3,266.61 = 790.79/x
3. Step 3: Cross multiply
   2,178.42x = 3,266.61 × 790.79
4. Step 4: Simplify right side
   2,178.42x = 2,583,182.23
5. Step 5: Solve for x
   x = 2,583,182.23/2,178.42
6. Step 6: Final answer
   x = 1,185.81