Finding the Fourth Proportional to 2,606.40, 3,910.56 and 1,147.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.40 : 3,910.56 = 1,147.68 : x
2. Step 2: Convert to fraction form
   2,606.40/3,910.56 = 1,147.68/x
3. Step 3: Cross multiply
   2,606.40x = 3,910.56 × 1,147.68
4. Step 4: Simplify right side
   2,606.40x = 4,488,071.50
5. Step 5: Solve for x
   x = 4,488,071.50/2,606.40
6. Step 6: Final answer
   x = 1,721.94