Finding the Fourth Proportional to 2,453.35, 3,384.86 and 1,390.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.35 : 3,384.86 = 1,390.94 : x
2. Step 2: Convert to fraction form
   2,453.35/3,384.86 = 1,390.94/x
3. Step 3: Cross multiply
   2,453.35x = 3,384.86 × 1,390.94
4. Step 4: Simplify right side
   2,453.35x = 4,708,137.17
5. Step 5: Solve for x
   x = 4,708,137.17/2,453.35
6. Step 6: Final answer
   x = 1,919.06