Finding the Fourth Proportional to 1,285.68, 1,773.38 and 788.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,285.68 : 1,773.38 = 788.10 : x
2. Step 2: Convert to fraction form
   1,285.68/1,773.38 = 788.10/x
3. Step 3: Cross multiply
   1,285.68x = 1,773.38 × 788.10
4. Step 4: Simplify right side
   1,285.68x = 1,397,600.78
5. Step 5: Solve for x
   x = 1,397,600.78/1,285.68
6. Step 6: Final answer
   x = 1,087.05