Finding the Fourth Proportional to 2,357.72, 3,253.76 and 1,309.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,357.72 : 3,253.76 = 1,309.78 : x
2. Step 2: Convert to fraction form
   2,357.72/3,253.76 = 1,309.78/x
3. Step 3: Cross multiply
   2,357.72x = 3,253.76 × 1,309.78
4. Step 4: Simplify right side
   2,357.72x = 4,261,712.20
5. Step 5: Solve for x
   x = 4,261,712.20/2,357.72
6. Step 6: Final answer
   x = 1,807.56