Finding the Fourth Proportional to 2,087.22, 3,129.81 and 788.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.22 : 3,129.81 = 788.79 : x
2. Step 2: Convert to fraction form
   2,087.22/3,129.81 = 788.79/x
3. Step 3: Cross multiply
   2,087.22x = 3,129.81 × 788.79
4. Step 4: Simplify right side
   2,087.22x = 2,468,762.83
5. Step 5: Solve for x
   x = 2,468,762.83/2,087.22
6. Step 6: Final answer
   x = 1,182.80