Finding the Fourth Proportional to 2,391.17, 3,300.21 and 1,396.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.17 : 3,300.21 = 1,396.58 : x
2. Step 2: Convert to fraction form
   2,391.17/3,300.21 = 1,396.58/x
3. Step 3: Cross multiply
   2,391.17x = 3,300.21 × 1,396.58
4. Step 4: Simplify right side
   2,391.17x = 4,608,990.78
5. Step 5: Solve for x
   x = 4,608,990.78/2,391.17
6. Step 6: Final answer
   x = 1,927.51