Finding the Fourth Proportional to 1,286.52, 1,773.52 and 788.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,286.52 : 1,773.52 = 788.84 : x
2. Step 2: Convert to fraction form
   1,286.52/1,773.52 = 788.84/x
3. Step 3: Cross multiply
   1,286.52x = 1,773.52 × 788.84
4. Step 4: Simplify right side
   1,286.52x = 1,399,023.52
5. Step 5: Solve for x
   x = 1,399,023.52/1,286.52
6. Step 6: Final answer
   x = 1,087.45