Finding the Fourth Proportional to 2,830.20, 4,243.59 and 1,185.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,830.20 : 4,243.59 = 1,185.90 : x
2. Step 2: Convert to fraction form
   2,830.20/4,243.59 = 1,185.90/x
3. Step 3: Cross multiply
   2,830.20x = 4,243.59 × 1,185.90
4. Step 4: Simplify right side
   2,830.20x = 5,032,473.38
5. Step 5: Solve for x
   x = 5,032,473.38/2,830.20
6. Step 6: Final answer
   x = 1,778.13