Finding the Fourth Proportional to 2,279.21, 3,145.55 and 1,395.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.21 : 3,145.55 = 1,395.60 : x
2. Step 2: Convert to fraction form
   2,279.21/3,145.55 = 1,395.60/x
3. Step 3: Cross multiply
   2,279.21x = 3,145.55 × 1,395.60
4. Step 4: Simplify right side
   2,279.21x = 4,389,922.60
5. Step 5: Solve for x
   x = 4,389,922.60/2,279.21
6. Step 6: Final answer
   x = 1,926.07