Finding the Fourth Proportional to 1,535.27, 2,118.90 and 905.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.27 : 2,118.90 = 905.59 : x
2. Step 2: Convert to fraction form
   1,535.27/2,118.90 = 905.59/x
3. Step 3: Cross multiply
   1,535.27x = 2,118.90 × 905.59
4. Step 4: Simplify right side
   1,535.27x = 1,918,854.65
5. Step 5: Solve for x
   x = 1,918,854.65/1,535.27
6. Step 6: Final answer
   x = 1,249.85