Finding the Fourth Proportional to 1,535.31, 2,118.72 and 905.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.31 : 2,118.72 = 905.83 : x
2. Step 2: Convert to fraction form
   1,535.31/2,118.72 = 905.83/x
3. Step 3: Cross multiply
   1,535.31x = 2,118.72 × 905.83
4. Step 4: Simplify right side
   1,535.31x = 1,919,200.14
5. Step 5: Solve for x
   x = 1,919,200.14/1,535.31
6. Step 6: Final answer
   x = 1,250.04