Finding the Fourth Proportional to 2,630.16, 3,945.82 and 781.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.16 : 3,945.82 = 781.42 : x
2. Step 2: Convert to fraction form
   2,630.16/3,945.82 = 781.42/x
3. Step 3: Cross multiply
   2,630.16x = 3,945.82 × 781.42
4. Step 4: Simplify right side
   2,630.16x = 3,083,342.66
5. Step 5: Solve for x
   x = 3,083,342.66/2,630.16
6. Step 6: Final answer
   x = 1,172.30