Finding the Fourth Proportional to 2,078.86, 3,117.40 and 691.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.86 : 3,117.40 = 691.82 : x
2. Step 2: Convert to fraction form
   2,078.86/3,117.40 = 691.82/x
3. Step 3: Cross multiply
   2,078.86x = 3,117.40 × 691.82
4. Step 4: Simplify right side
   2,078.86x = 2,156,679.67
5. Step 5: Solve for x
   x = 2,156,679.67/2,078.86
6. Step 6: Final answer
   x = 1,037.43