Finding the Fourth Proportional to 2,654.74, 3,981.12 and 780.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,654.74 : 3,981.12 = 780.06 : x
2. Step 2: Convert to fraction form
   2,654.74/3,981.12 = 780.06/x
3. Step 3: Cross multiply
   2,654.74x = 3,981.12 × 780.06
4. Step 4: Simplify right side
   2,654.74x = 3,105,524.47
5. Step 5: Solve for x
   x = 3,105,524.47/2,654.74
6. Step 6: Final answer
   x = 1,169.80