Finding the Fourth Proportional to 1,559.12, 2,336.52 and 788.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.12 : 2,336.52 = 788.72 : x
2. Step 2: Convert to fraction form
   1,559.12/2,336.52 = 788.72/x
3. Step 3: Cross multiply
   1,559.12x = 2,336.52 × 788.72
4. Step 4: Simplify right side
   1,559.12x = 1,842,860.05
5. Step 5: Solve for x
   x = 1,842,860.05/1,559.12
6. Step 6: Final answer
   x = 1,181.99