Finding the Fourth Proportional to 2,178.98, 3,007.17 and 1,247.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.98 : 3,007.17 = 1,247.54 : x
2. Step 2: Convert to fraction form
   2,178.98/3,007.17 = 1,247.54/x
3. Step 3: Cross multiply
   2,178.98x = 3,007.17 × 1,247.54
4. Step 4: Simplify right side
   2,178.98x = 3,751,564.86
5. Step 5: Solve for x
   x = 3,751,564.86/2,178.98
6. Step 6: Final answer
   x = 1,721.71