Finding the Fourth Proportional to 2,155.56, 2,977.92 and 1,920.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.56 : 2,977.92 = 1,920.36 : x
2. Step 2: Convert to fraction form
   2,155.56/2,977.92 = 1,920.36/x
3. Step 3: Cross multiply
   2,155.56x = 2,977.92 × 1,920.36
4. Step 4: Simplify right side
   2,155.56x = 5,718,678.45
5. Step 5: Solve for x
   x = 5,718,678.45/2,155.56
6. Step 6: Final answer
   x = 2,652.99