Finding the Fourth Proportional to 2,235.21, 3,085.04 and 1,291.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,235.21 : 3,085.04 = 1,291.15 : x
2. Step 2: Convert to fraction form
   2,235.21/3,085.04 = 1,291.15/x
3. Step 3: Cross multiply
   2,235.21x = 3,085.04 × 1,291.15
4. Step 4: Simplify right side
   2,235.21x = 3,983,246.80
5. Step 5: Solve for x
   x = 3,983,246.80/2,235.21
6. Step 6: Final answer
   x = 1,782.05