Finding the Fourth Proportional to 2,253.31, 3,109.55 and 1,258.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,253.31 : 3,109.55 = 1,258.56 : x
2. Step 2: Convert to fraction form
   2,253.31/3,109.55 = 1,258.56/x
3. Step 3: Cross multiply
   2,253.31x = 3,109.55 × 1,258.56
4. Step 4: Simplify right side
   2,253.31x = 3,913,548.96
5. Step 5: Solve for x
   x = 3,913,548.96/2,253.31
6. Step 6: Final answer
   x = 1,736.80