Finding the Fourth Proportional to 2,782.72, 4,168.56 and 1,392.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,782.72 : 4,168.56 = 1,392.16 : x
2. Step 2: Convert to fraction form
   2,782.72/4,168.56 = 1,392.16/x
3. Step 3: Cross multiply
   2,782.72x = 4,168.56 × 1,392.16
4. Step 4: Simplify right side
   2,782.72x = 5,803,302.49
5. Step 5: Solve for x
   x = 5,803,302.49/2,782.72
6. Step 6: Final answer
   x = 2,085.48