Finding the Fourth Proportional to 2,559.21, 3,835.10 and 1,388.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.21 : 3,835.10 = 1,388.22 : x
2. Step 2: Convert to fraction form
   2,559.21/3,835.10 = 1,388.22/x
3. Step 3: Cross multiply
   2,559.21x = 3,835.10 × 1,388.22
4. Step 4: Simplify right side
   2,559.21x = 5,323,955.58
5. Step 5: Solve for x
   x = 5,323,955.58/2,559.21
6. Step 6: Final answer
   x = 2,080.31