Finding the Fourth Proportional to 2,078.86, 3,117.24 and 691.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.86 : 3,117.24 = 691.71 : x
2. Step 2: Convert to fraction form
   2,078.86/3,117.24 = 691.71/x
3. Step 3: Cross multiply
   2,078.86x = 3,117.24 × 691.71
4. Step 4: Simplify right side
   2,078.86x = 2,156,224.78
5. Step 5: Solve for x
   x = 2,156,224.78/2,078.86
6. Step 6: Final answer
   x = 1,037.22