Finding the Fourth Proportional to 2,171.39, 3,257.69 and 690.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.39 : 3,257.69 = 690.50 : x
2. Step 2: Convert to fraction form
   2,171.39/3,257.69 = 690.50/x
3. Step 3: Cross multiply
   2,171.39x = 3,257.69 × 690.50
4. Step 4: Simplify right side
   2,171.39x = 2,249,439.64
5. Step 5: Solve for x
   x = 2,249,439.64/2,171.39
6. Step 6: Final answer
   x = 1,035.95