Finding the Fourth Proportional to 1,767.69, 2,439.55 and 981.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,767.69 : 2,439.55 = 981.78 : x
2. Step 2: Convert to fraction form
   1,767.69/2,439.55 = 981.78/x
3. Step 3: Cross multiply
   1,767.69x = 2,439.55 × 981.78
4. Step 4: Simplify right side
   1,767.69x = 2,395,101.40
5. Step 5: Solve for x
   x = 2,395,101.40/1,767.69
6. Step 6: Final answer
   x = 1,354.94