Finding the Fourth Proportional to 2,630.43, 3,945.42 and 781.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.43 : 3,945.42 = 781.34 : x
2. Step 2: Convert to fraction form
   2,630.43/3,945.42 = 781.34/x
3. Step 3: Cross multiply
   2,630.43x = 3,945.42 × 781.34
4. Step 4: Simplify right side
   2,630.43x = 3,082,694.74
5. Step 5: Solve for x
   x = 3,082,694.74/2,630.43
6. Step 6: Final answer
   x = 1,171.94