Finding the Fourth Proportional to 1,387.10, 1,912.28 and 944.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.10 : 1,912.28 = 944.24 : x
2. Step 2: Convert to fraction form
   1,387.10/1,912.28 = 944.24/x
3. Step 3: Cross multiply
   1,387.10x = 1,912.28 × 944.24
4. Step 4: Simplify right side
   1,387.10x = 1,805,651.27
5. Step 5: Solve for x
   x = 1,805,651.27/1,387.10
6. Step 6: Final answer
   x = 1,301.75