Finding the Fourth Proportional to 2,171.88, 3,258.01 and 611.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.88 : 3,258.01 = 611.89 : x
2. Step 2: Convert to fraction form
   2,171.88/3,258.01 = 611.89/x
3. Step 3: Cross multiply
   2,171.88x = 3,258.01 × 611.89
4. Step 4: Simplify right side
   2,171.88x = 1,993,554.43
5. Step 5: Solve for x
   x = 1,993,554.43/2,171.88
6. Step 6: Final answer
   x = 917.89