Finding the Fourth Proportional to 2,145.16, 3,218.22 and 847.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.16 : 3,218.22 = 847.96 : x
2. Step 2: Convert to fraction form
   2,145.16/3,218.22 = 847.96/x
3. Step 3: Cross multiply
   2,145.16x = 3,218.22 × 847.96
4. Step 4: Simplify right side
   2,145.16x = 2,728,921.83
5. Step 5: Solve for x
   x = 2,728,921.83/2,145.16
6. Step 6: Final answer
   x = 1,272.13