Finding the Fourth Proportional to 2,085.58, 3,129.94 and 1,425.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.58 : 3,129.94 = 1,425.88 : x
2. Step 2: Convert to fraction form
   2,085.58/3,129.94 = 1,425.88/x
3. Step 3: Cross multiply
   2,085.58x = 3,129.94 × 1,425.88
4. Step 4: Simplify right side
   2,085.58x = 4,462,903.20
5. Step 5: Solve for x
   x = 4,462,903.20/2,085.58
6. Step 6: Final answer
   x = 2,139.89