Finding the Fourth Proportional to 1,281.27, 1,920.18 and 786.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.27 : 1,920.18 = 786.12 : x
2. Step 2: Convert to fraction form
   1,281.27/1,920.18 = 786.12/x
3. Step 3: Cross multiply
   1,281.27x = 1,920.18 × 786.12
4. Step 4: Simplify right side
   1,281.27x = 1,509,491.90
5. Step 5: Solve for x
   x = 1,509,491.90/1,281.27
6. Step 6: Final answer
   x = 1,178.12