Finding the Fourth Proportional to 2,188.39, 3,019.85 and 1,256.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.39 : 3,019.85 = 1,256.89 : x
2. Step 2: Convert to fraction form
   2,188.39/3,019.85 = 1,256.89/x
3. Step 3: Cross multiply
   2,188.39x = 3,019.85 × 1,256.89
4. Step 4: Simplify right side
   2,188.39x = 3,795,604.17
5. Step 5: Solve for x
   x = 3,795,604.17/2,188.39
6. Step 6: Final answer
   x = 1,734.43