Finding the Fourth Proportional to 1,393.72, 1,922.89 and 995.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.72 : 1,922.89 = 995.05 : x
2. Step 2: Convert to fraction form
   1,393.72/1,922.89 = 995.05/x
3. Step 3: Cross multiply
   1,393.72x = 1,922.89 × 995.05
4. Step 4: Simplify right side
   1,393.72x = 1,913,371.69
5. Step 5: Solve for x
   x = 1,913,371.69/1,393.72
6. Step 6: Final answer
   x = 1,372.85