Finding the Fourth Proportional to 2,388.90, 3,296.11 and 1,393.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.90 : 3,296.11 = 1,393.61 : x
2. Step 2: Convert to fraction form
   2,388.90/3,296.11 = 1,393.61/x
3. Step 3: Cross multiply
   2,388.90x = 3,296.11 × 1,393.61
4. Step 4: Simplify right side
   2,388.90x = 4,593,484.89
5. Step 5: Solve for x
   x = 4,593,484.89/2,388.90
6. Step 6: Final answer
   x = 1,922.85