Finding the Fourth Proportional to 2,830.72, 4,253.76 and 2,661.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,830.72 : 4,253.76 = 2,661.76 : x
2. Step 2: Convert to fraction form
   2,830.72/4,253.76 = 2,661.76/x
3. Step 3: Cross multiply
   2,830.72x = 4,253.76 × 2,661.76
4. Step 4: Simplify right side
   2,830.72x = 11,322,488.22
5. Step 5: Solve for x
   x = 11,322,488.22/2,830.72
6. Step 6: Final answer
   x = 3,999.86