Finding the Fourth Proportional to 2,079.74, 3,120.39 and 969.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.74 : 3,120.39 = 969.72 : x
2. Step 2: Convert to fraction form
   2,079.74/3,120.39 = 969.72/x
3. Step 3: Cross multiply
   2,079.74x = 3,120.39 × 969.72
4. Step 4: Simplify right side
   2,079.74x = 3,025,904.59
5. Step 5: Solve for x
   x = 3,025,904.59/2,079.74
6. Step 6: Final answer
   x = 1,454.95