Finding the Fourth Proportional to 2,785.34, 4,178.06 and 911.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,785.34 : 4,178.06 = 911.22 : x
2. Step 2: Convert to fraction form
   2,785.34/4,178.06 = 911.22/x
3. Step 3: Cross multiply
   2,785.34x = 4,178.06 × 911.22
4. Step 4: Simplify right side
   2,785.34x = 3,807,131.83
5. Step 5: Solve for x
   x = 3,807,131.83/2,785.34
6. Step 6: Final answer
   x = 1,366.85