Finding the Fourth Proportional to 2,857.05, 4,284.82 and 1,212.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.05 : 4,284.82 = 1,212.75 : x
2. Step 2: Convert to fraction form
   2,857.05/4,284.82 = 1,212.75/x
3. Step 3: Cross multiply
   2,857.05x = 4,284.82 × 1,212.75
4. Step 4: Simplify right side
   2,857.05x = 5,196,415.46
5. Step 5: Solve for x
   x = 5,196,415.46/2,857.05
6. Step 6: Final answer
   x = 1,818.80