Finding the Fourth Proportional to 2,636.88, 3,955.34 and 905.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.88 : 3,955.34 = 905.50 : x
2. Step 2: Convert to fraction form
   2,636.88/3,955.34 = 905.50/x
3. Step 3: Cross multiply
   2,636.88x = 3,955.34 × 905.50
4. Step 4: Simplify right side
   2,636.88x = 3,581,560.37
5. Step 5: Solve for x
   x = 3,581,560.37/2,636.88
6. Step 6: Final answer
   x = 1,358.26