Finding the Fourth Proportional to 1,855.55, 2,779.28 and 1,123.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,855.55 : 2,779.28 = 1,123.85 : x
2. Step 2: Convert to fraction form
   1,855.55/2,779.28 = 1,123.85/x
3. Step 3: Cross multiply
   1,855.55x = 2,779.28 × 1,123.85
4. Step 4: Simplify right side
   1,855.55x = 3,123,488.21
5. Step 5: Solve for x
   x = 3,123,488.21/1,855.55
6. Step 6: Final answer
   x = 1,683.32