Finding the Fourth Proportional to 1,243.55, 1,865.69 and 774.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.55 : 1,865.69 = 774.71 : x
2. Step 2: Convert to fraction form
   1,243.55/1,865.69 = 774.71/x
3. Step 3: Cross multiply
   1,243.55x = 1,865.69 × 774.71
4. Step 4: Simplify right side
   1,243.55x = 1,445,361.31
5. Step 5: Solve for x
   x = 1,445,361.31/1,243.55
6. Step 6: Final answer
   x = 1,162.29