Finding the Fourth Proportional to 2,772.07, 4,155.01 and 1,386.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,772.07 : 4,155.01 = 1,386.56 : x
2. Step 2: Convert to fraction form
   2,772.07/4,155.01 = 1,386.56/x
3. Step 3: Cross multiply
   2,772.07x = 4,155.01 × 1,386.56
4. Step 4: Simplify right side
   2,772.07x = 5,761,177.59
5. Step 5: Solve for x
   x = 5,761,177.59/2,772.07
6. Step 6: Final answer
   x = 2,078.30