Finding the Fourth Proportional to 2,850, 4,274.72 and 1,390.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,850 : 4,274.72 = 1,390.16 : x
2. Step 2: Convert to fraction form
   2,850/4,274.72 = 1,390.16/x
3. Step 3: Cross multiply
   2,850x = 4,274.72 × 1,390.16
4. Step 4: Simplify right side
   2,850x = 5,942,544.76
5. Step 5: Solve for x
   x = 5,942,544.76/2,850
6. Step 6: Final answer
   x = 2,085.10