Finding the Fourth Proportional to 2,077.83, 3,117.42 and 691.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,077.83 : 3,117.42 = 691.20 : x
2. Step 2: Convert to fraction form
   2,077.83/3,117.42 = 691.20/x
3. Step 3: Cross multiply
   2,077.83x = 3,117.42 × 691.20
4. Step 4: Simplify right side
   2,077.83x = 2,154,760.70
5. Step 5: Solve for x
   x = 2,154,760.70/2,077.83
6. Step 6: Final answer
   x = 1,037.02