Finding the Fourth Proportional to 2,147.76, 3,224.34 and 1,857.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.76 : 3,224.34 = 1,857.12 : x
2. Step 2: Convert to fraction form
   2,147.76/3,224.34 = 1,857.12/x
3. Step 3: Cross multiply
   2,147.76x = 3,224.34 × 1,857.12
4. Step 4: Simplify right side
   2,147.76x = 5,987,986.30
5. Step 5: Solve for x
   x = 5,987,986.30/2,147.76
6. Step 6: Final answer
   x = 2,788.01