Finding the Fourth Proportional to 2,858.02, 4,287.69 and 910.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.02 : 4,287.69 = 910.21 : x
2. Step 2: Convert to fraction form
   2,858.02/4,287.69 = 910.21/x
3. Step 3: Cross multiply
   2,858.02x = 4,287.69 × 910.21
4. Step 4: Simplify right side
   2,858.02x = 3,902,698.31
5. Step 5: Solve for x
   x = 3,902,698.31/2,858.02
6. Step 6: Final answer
   x = 1,365.53