Finding the Fourth Proportional to 2,142.85, 3,215.34 and 1,047.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.85 : 3,215.34 = 1,047.19 : x
2. Step 2: Convert to fraction form
   2,142.85/3,215.34 = 1,047.19/x
3. Step 3: Cross multiply
   2,142.85x = 3,215.34 × 1,047.19
4. Step 4: Simplify right side
   2,142.85x = 3,367,066.66
5. Step 5: Solve for x
   x = 3,367,066.66/2,142.85
6. Step 6: Final answer
   x = 1,571.30