Finding the Fourth Proportional to 1,315.86, 1,974.38 and 699.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.86 : 1,974.38 = 699.42 : x
2. Step 2: Convert to fraction form
   1,315.86/1,974.38 = 699.42/x
3. Step 3: Cross multiply
   1,315.86x = 1,974.38 × 699.42
4. Step 4: Simplify right side
   1,315.86x = 1,380,920.86
5. Step 5: Solve for x
   x = 1,380,920.86/1,315.86
6. Step 6: Final answer
   x = 1,049.44