Finding the Fourth Proportional to 1,396.53, 2,103.06 and 1,216.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.53 : 2,103.06 = 1,216.10 : x
2. Step 2: Convert to fraction form
   1,396.53/2,103.06 = 1,216.10/x
3. Step 3: Cross multiply
   1,396.53x = 2,103.06 × 1,216.10
4. Step 4: Simplify right side
   1,396.53x = 2,557,520.75
5. Step 5: Solve for x
   x = 2,557,520.75/1,396.53
6. Step 6: Final answer
   x = 1,831.34