Finding the Fourth Proportional to 2,258.89, 3,392.79 and 2,161.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,258.89 : 3,392.79 = 2,161.69 : x
2. Step 2: Convert to fraction form
   2,258.89/3,392.79 = 2,161.69/x
3. Step 3: Cross multiply
   2,258.89x = 3,392.79 × 2,161.69
4. Step 4: Simplify right side
   2,258.89x = 7,334,160.22
5. Step 5: Solve for x
   x = 7,334,160.22/2,258.89
6. Step 6: Final answer
   x = 3,246.80