Finding the Fourth Proportional to 2,085.03, 3,129.35 and 1,085.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.03 : 3,129.35 = 1,085.09 : x
2. Step 2: Convert to fraction form
   2,085.03/3,129.35 = 1,085.09/x
3. Step 3: Cross multiply
   2,085.03x = 3,129.35 × 1,085.09
4. Step 4: Simplify right side
   2,085.03x = 3,395,605.32
5. Step 5: Solve for x
   x = 3,395,605.32/2,085.03
6. Step 6: Final answer
   x = 1,628.56