Finding the Fourth Proportional to 1,228.69, 1,695.12 and 786.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.69 : 1,695.12 = 786.52 : x
2. Step 2: Convert to fraction form
   1,228.69/1,695.12 = 786.52/x
3. Step 3: Cross multiply
   1,228.69x = 1,695.12 × 786.52
4. Step 4: Simplify right side
   1,228.69x = 1,333,237.31
5. Step 5: Solve for x
   x = 1,333,237.31/1,228.69
6. Step 6: Final answer
   x = 1,085.09