Finding the Fourth Proportional to 2,630.78, 3,946.78 and 781.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.78 : 3,946.78 = 781.85 : x
2. Step 2: Convert to fraction form
   2,630.78/3,946.78 = 781.85/x
3. Step 3: Cross multiply
   2,630.78x = 3,946.78 × 781.85
4. Step 4: Simplify right side
   2,630.78x = 3,085,796.39
5. Step 5: Solve for x
   x = 3,085,796.39/2,630.78
6. Step 6: Final answer
   x = 1,172.96