Finding the Fourth Proportional to 2,171.88, 3,258.12 and 690.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.88 : 3,258.12 = 690.60 : x
2. Step 2: Convert to fraction form
   2,171.88/3,258.12 = 690.60/x
3. Step 3: Cross multiply
   2,171.88x = 3,258.12 × 690.60
4. Step 4: Simplify right side
   2,171.88x = 2,250,057.67
5. Step 5: Solve for x
   x = 2,250,057.67/2,171.88
6. Step 6: Final answer
   x = 1,036.00