Finding the Fourth Proportional to 1,395.40, 1,923.42 and 1,100.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.40 : 1,923.42 = 1,100.20 : x
2. Step 2: Convert to fraction form
   1,395.40/1,923.42 = 1,100.20/x
3. Step 3: Cross multiply
   1,395.40x = 1,923.42 × 1,100.20
4. Step 4: Simplify right side
   1,395.40x = 2,116,146.68
5. Step 5: Solve for x
   x = 2,116,146.68/1,395.40
6. Step 6: Final answer
   x = 1,516.52