Finding the Fourth Proportional to 2,101.29, 3,145.20 and 1,396.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.29 : 3,145.20 = 1,396.89 : x
2. Step 2: Convert to fraction form
   2,101.29/3,145.20 = 1,396.89/x
3. Step 3: Cross multiply
   2,101.29x = 3,145.20 × 1,396.89
4. Step 4: Simplify right side
   2,101.29x = 4,393,498.43
5. Step 5: Solve for x
   x = 4,393,498.43/2,101.29
6. Step 6: Final answer
   x = 2,090.86