Finding the Fourth Proportional to 1,123.36, 1,548.90 and 912.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.36 : 1,548.90 = 912.88 : x
2. Step 2: Convert to fraction form
   1,123.36/1,548.90 = 912.88/x
3. Step 3: Cross multiply
   1,123.36x = 1,548.90 × 912.88
4. Step 4: Simplify right side
   1,123.36x = 1,413,959.83
5. Step 5: Solve for x
   x = 1,413,959.83/1,123.36
6. Step 6: Final answer
   x = 1,258.69