Finding the Fourth Proportional to 2,189.56, 3,021.54 and 1,258.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.56 : 3,021.54 = 1,258.12 : x
2. Step 2: Convert to fraction form
   2,189.56/3,021.54 = 1,258.12/x
3. Step 3: Cross multiply
   2,189.56x = 3,021.54 × 1,258.12
4. Step 4: Simplify right side
   2,189.56x = 3,801,459.90
5. Step 5: Solve for x
   x = 3,801,459.90/2,189.56
6. Step 6: Final answer
   x = 1,736.18