Finding the Fourth Proportional to 1,123.76, 1,550.95 and 843.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.76 : 1,550.95 = 843.55 : x
2. Step 2: Convert to fraction form
   1,123.76/1,550.95 = 843.55/x
3. Step 3: Cross multiply
   1,123.76x = 1,550.95 × 843.55
4. Step 4: Simplify right side
   1,123.76x = 1,308,297.89
5. Step 5: Solve for x
   x = 1,308,297.89/1,123.76
6. Step 6: Final answer
   x = 1,164.22