Finding the Fourth Proportional to 2,860.02, 4,290.69 and 912.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.02 : 4,290.69 = 912.21 : x
2. Step 2: Convert to fraction form
   2,860.02/4,290.69 = 912.21/x
3. Step 3: Cross multiply
   2,860.02x = 4,290.69 × 912.21
4. Step 4: Simplify right side
   2,860.02x = 3,914,010.32
5. Step 5: Solve for x
   x = 3,914,010.32/2,860.02
6. Step 6: Final answer
   x = 1,368.53