Finding the Fourth Proportional to 2,379.78, 3,570.89 and 2,199.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.78 : 3,570.89 = 2,199.35 : x
2. Step 2: Convert to fraction form
   2,379.78/3,570.89 = 2,199.35/x
3. Step 3: Cross multiply
   2,379.78x = 3,570.89 × 2,199.35
4. Step 4: Simplify right side
   2,379.78x = 7,853,634.85
5. Step 5: Solve for x
   x = 7,853,634.85/2,379.78
6. Step 6: Final answer
   x = 3,300.15