Finding the Fourth Proportional to 1,651.25, 2,278.71 and 905.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,651.25 : 2,278.71 = 905.21 : x
2. Step 2: Convert to fraction form
   1,651.25/2,278.71 = 905.21/x
3. Step 3: Cross multiply
   1,651.25x = 2,278.71 × 905.21
4. Step 4: Simplify right side
   1,651.25x = 2,062,699.69
5. Step 5: Solve for x
   x = 2,062,699.69/1,651.25
6. Step 6: Final answer
   x = 1,249.18