Finding the Fourth Proportional to 2,771.32, 4,155.12 and 1,309.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,771.32 : 4,155.12 = 1,309.72 : x
2. Step 2: Convert to fraction form
   2,771.32/4,155.12 = 1,309.72/x
3. Step 3: Cross multiply
   2,771.32x = 4,155.12 × 1,309.72
4. Step 4: Simplify right side
   2,771.32x = 5,442,043.77
5. Step 5: Solve for x
   x = 5,442,043.77/2,771.32
6. Step 6: Final answer
   x = 1,963.70