Finding the Fourth Proportional to 2,178.35, 3,267.89 and 791.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.35 : 3,267.89 = 791.76 : x
2. Step 2: Convert to fraction form
   2,178.35/3,267.89 = 791.76/x
3. Step 3: Cross multiply
   2,178.35x = 3,267.89 × 791.76
4. Step 4: Simplify right side
   2,178.35x = 2,587,384.59
5. Step 5: Solve for x
   x = 2,587,384.59/2,178.35
6. Step 6: Final answer
   x = 1,187.77