Finding the Fourth Proportional to 2,818.72, 4,228.77 and 969.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.72 : 4,228.77 = 969.91 : x
2. Step 2: Convert to fraction form
   2,818.72/4,228.77 = 969.91/x
3. Step 3: Cross multiply
   2,818.72x = 4,228.77 × 969.91
4. Step 4: Simplify right side
   2,818.72x = 4,101,533.12
5. Step 5: Solve for x
   x = 4,101,533.12/2,818.72
6. Step 6: Final answer
   x = 1,455.10