Finding the Fourth Proportional to 2,258.50, 3,123.21 and 2,155.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,258.50 : 3,123.21 = 2,155.36 : x
2. Step 2: Convert to fraction form
   2,258.50/3,123.21 = 2,155.36/x
3. Step 3: Cross multiply
   2,258.50x = 3,123.21 × 2,155.36
4. Step 4: Simplify right side
   2,258.50x = 6,731,641.91
5. Step 5: Solve for x
   x = 6,731,641.91/2,258.50
6. Step 6: Final answer
   x = 2,980.58