Finding the Fourth Proportional to 2,279.78, 3,144.47 and 1,571.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.78 : 3,144.47 = 1,571.90 : x
2. Step 2: Convert to fraction form
   2,279.78/3,144.47 = 1,571.90/x
3. Step 3: Cross multiply
   2,279.78x = 3,144.47 × 1,571.90
4. Step 4: Simplify right side
   2,279.78x = 4,942,768.81
5. Step 5: Solve for x
   x = 4,942,768.81/2,279.78
6. Step 6: Final answer
   x = 2,168.10