Finding the Fourth Proportional to 1,005.72, 1,393.61 and 944.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.72 : 1,393.61 = 944.06 : x
2. Step 2: Convert to fraction form
   1,005.72/1,393.61 = 944.06/x
3. Step 3: Cross multiply
   1,005.72x = 1,393.61 × 944.06
4. Step 4: Simplify right side
   1,005.72x = 1,315,639.77
5. Step 5: Solve for x
   x = 1,315,639.77/1,005.72
6. Step 6: Final answer
   x = 1,308.16