Finding the Fourth Proportional to 2,630.03, 3,943.67 and 780.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.03 : 3,943.67 = 780.89 : x
2. Step 2: Convert to fraction form
   2,630.03/3,943.67 = 780.89/x
3. Step 3: Cross multiply
   2,630.03x = 3,943.67 × 780.89
4. Step 4: Simplify right side
   2,630.03x = 3,079,584.28
5. Step 5: Solve for x
   x = 3,079,584.28/2,630.03
6. Step 6: Final answer
   x = 1,170.93