Finding the Fourth Proportional to 2,391.89, 3,300.80 and 1,396.97

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.89 : 3,300.80 = 1,396.97 : x
2. Step 2: Convert to fraction form
   2,391.89/3,300.80 = 1,396.97/x
3. Step 3: Cross multiply
   2,391.89x = 3,300.80 × 1,396.97
4. Step 4: Simplify right side
   2,391.89x = 4,611,095.09
5. Step 5: Solve for x
   x = 4,611,095.09/2,391.89
6. Step 6: Final answer
   x = 1,927.81