Finding the Fourth Proportional to 2,335.39, 3,501.86 and 691.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,335.39 : 3,501.86 = 691.71 : x
2. Step 2: Convert to fraction form
   2,335.39/3,501.86 = 691.71/x
3. Step 3: Cross multiply
   2,335.39x = 3,501.86 × 691.71
4. Step 4: Simplify right side
   2,335.39x = 2,422,271.58
5. Step 5: Solve for x
   x = 2,422,271.58/2,335.39
6. Step 6: Final answer
   x = 1,037.20