Finding the Fourth Proportional to 1,855.98, 2,559.60 and 1,661.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,855.98 : 2,559.60 = 1,661.58 : x
2. Step 2: Convert to fraction form
   1,855.98/2,559.60 = 1,661.58/x
3. Step 3: Cross multiply
   1,855.98x = 2,559.60 × 1,661.58
4. Step 4: Simplify right side
   1,855.98x = 4,252,980.17
5. Step 5: Solve for x
   x = 4,252,980.17/1,855.98
6. Step 6: Final answer
   x = 2,291.50