Finding the Fourth Proportional to 1,815.55, 2,724.10 and 775.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.55 : 2,724.10 = 775.78 : x
2. Step 2: Convert to fraction form
   1,815.55/2,724.10 = 775.78/x
3. Step 3: Cross multiply
   1,815.55x = 2,724.10 × 775.78
4. Step 4: Simplify right side
   1,815.55x = 2,113,293.55
5. Step 5: Solve for x
   x = 2,113,293.55/1,815.55
6. Step 6: Final answer
   x = 1,164.00