Finding the Fourth Proportional to 1,402.56, 1,936.58 and 905.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.56 : 1,936.58 = 905.50 : x
2. Step 2: Convert to fraction form
   1,402.56/1,936.58 = 905.50/x
3. Step 3: Cross multiply
   1,402.56x = 1,936.58 × 905.50
4. Step 4: Simplify right side
   1,402.56x = 1,753,573.19
5. Step 5: Solve for x
   x = 1,753,573.19/1,402.56
6. Step 6: Final answer
   x = 1,250.27