Finding the Fourth Proportional to 2,235.98, 3,085.56 and 1,291.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,235.98 : 3,085.56 = 1,291.78 : x
2. Step 2: Convert to fraction form
   2,235.98/3,085.56 = 1,291.78/x
3. Step 3: Cross multiply
   2,235.98x = 3,085.56 × 1,291.78
4. Step 4: Simplify right side
   2,235.98x = 3,985,864.70
5. Step 5: Solve for x
   x = 3,985,864.70/2,235.98
6. Step 6: Final answer
   x = 1,782.60