Finding the Fourth Proportional to 2,356.78, 3,251.40 and 1,361.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,356.78 : 3,251.40 = 1,361.86 : x
2. Step 2: Convert to fraction form
   2,356.78/3,251.40 = 1,361.86/x
3. Step 3: Cross multiply
   2,356.78x = 3,251.40 × 1,361.86
4. Step 4: Simplify right side
   2,356.78x = 4,427,951.60
5. Step 5: Solve for x
   x = 4,427,951.60/2,356.78
6. Step 6: Final answer
   x = 1,878.81