Finding the Fourth Proportional to 1,393.28, 1,918.56 and 1,082.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.28 : 1,918.56 = 1,082.24 : x
2. Step 2: Convert to fraction form
   1,393.28/1,918.56 = 1,082.24/x
3. Step 3: Cross multiply
   1,393.28x = 1,918.56 × 1,082.24
4. Step 4: Simplify right side
   1,393.28x = 2,076,342.37
5. Step 5: Solve for x
   x = 2,076,342.37/1,393.28
6. Step 6: Final answer
   x = 1,490.25