Finding the Fourth Proportional to 2,398.16, 3,309.72 and 1,691.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,398.16 : 3,309.72 = 1,691.12 : x
2. Step 2: Convert to fraction form
   2,398.16/3,309.72 = 1,691.12/x
3. Step 3: Cross multiply
   2,398.16x = 3,309.72 × 1,691.12
4. Step 4: Simplify right side
   2,398.16x = 5,597,133.69
5. Step 5: Solve for x
   x = 5,597,133.69/2,398.16
6. Step 6: Final answer
   x = 2,333.93