Finding the Fourth Proportional to 1,911.39, 2,636.22 and 1,281.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.39 : 2,636.22 = 1,281.72 : x
2. Step 2: Convert to fraction form
   1,911.39/2,636.22 = 1,281.72/x
3. Step 3: Cross multiply
   1,911.39x = 2,636.22 × 1,281.72
4. Step 4: Simplify right side
   1,911.39x = 3,378,895.90
5. Step 5: Solve for x
   x = 3,378,895.90/1,911.39
6. Step 6: Final answer
   x = 1,767.77