Finding the Fourth Proportional to 1,123.76, 1,550.76 and 1,090.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.76 : 1,550.76 = 1,090.64 : x
2. Step 2: Convert to fraction form
   1,123.76/1,550.76 = 1,090.64/x
3. Step 3: Cross multiply
   1,123.76x = 1,550.76 × 1,090.64
4. Step 4: Simplify right side
   1,123.76x = 1,691,320.89
5. Step 5: Solve for x
   x = 1,691,320.89/1,123.76
6. Step 6: Final answer
   x = 1,505.06