Finding the Fourth Proportional to 1,541.32, 2,128.80 and 1,123.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,541.32 : 2,128.80 = 1,123.54 : x
2. Step 2: Convert to fraction form
   1,541.32/2,128.80 = 1,123.54/x
3. Step 3: Cross multiply
   1,541.32x = 2,128.80 × 1,123.54
4. Step 4: Simplify right side
   1,541.32x = 2,391,791.95
5. Step 5: Solve for x
   x = 2,391,791.95/1,541.32
6. Step 6: Final answer
   x = 1,551.78