Finding the Fourth Proportional to 1,123.77, 1,677.42 and 1,042.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.77 : 1,677.42 = 1,042.45 : x
2. Step 2: Convert to fraction form
   1,123.77/1,677.42 = 1,042.45/x
3. Step 3: Cross multiply
   1,123.77x = 1,677.42 × 1,042.45
4. Step 4: Simplify right side
   1,123.77x = 1,748,626.48
5. Step 5: Solve for x
   x = 1,748,626.48/1,123.77
6. Step 6: Final answer
   x = 1,556.04