Finding the Fourth Proportional to 2,630.39, 3,944.90 and 781.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.39 : 3,944.90 = 781.08 : x
2. Step 2: Convert to fraction form
   2,630.39/3,944.90 = 781.08/x
3. Step 3: Cross multiply
   2,630.39x = 3,944.90 × 781.08
4. Step 4: Simplify right side
   2,630.39x = 3,081,278.59
5. Step 5: Solve for x
   x = 3,081,278.59/2,630.39
6. Step 6: Final answer
   x = 1,171.42