Finding the Fourth Proportional to 2,123.24, 3,189.72 and 1,258.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.24 : 3,189.72 = 1,258.16 : x
2. Step 2: Convert to fraction form
   2,123.24/3,189.72 = 1,258.16/x
3. Step 3: Cross multiply
   2,123.24x = 3,189.72 × 1,258.16
4. Step 4: Simplify right side
   2,123.24x = 4,013,178.12
5. Step 5: Solve for x
   x = 4,013,178.12/2,123.24
6. Step 6: Final answer
   x = 1,890.12