Finding the Fourth Proportional to 2,845.56, 3,922.38 and 2,145.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,845.56 : 3,922.38 = 2,145.72 : x
2. Step 2: Convert to fraction form
   2,845.56/3,922.38 = 2,145.72/x
3. Step 3: Cross multiply
   2,845.56x = 3,922.38 × 2,145.72
4. Step 4: Simplify right side
   2,845.56x = 8,416,329.21
5. Step 5: Solve for x
   x = 8,416,329.21/2,845.56
6. Step 6: Final answer
   x = 2,957.71