Finding the Fourth Proportional to 2,654.66, 3,981.04 and 780.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,654.66 : 3,981.04 = 780.05 : x
2. Step 2: Convert to fraction form
   2,654.66/3,981.04 = 780.05/x
3. Step 3: Cross multiply
   2,654.66x = 3,981.04 × 780.05
4. Step 4: Simplify right side
   2,654.66x = 3,105,418.25
5. Step 5: Solve for x
   x = 3,105,418.25/2,654.66
6. Step 6: Final answer
   x = 1,169.80