Finding the Fourth Proportional to 2,858.56, 4,284.07 and 1,213.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.56 : 4,284.07 = 1,213.07 : x
2. Step 2: Convert to fraction form
   2,858.56/4,284.07 = 1,213.07/x
3. Step 3: Cross multiply
   2,858.56x = 4,284.07 × 1,213.07
4. Step 4: Simplify right side
   2,858.56x = 5,196,852.34
5. Step 5: Solve for x
   x = 5,196,852.34/2,858.56
6. Step 6: Final answer
   x = 1,818.00