Finding the Fourth Proportional to 1,436.81, 2,158.82 and 917.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.81 : 2,158.82 = 917.05 : x
2. Step 2: Convert to fraction form
   1,436.81/2,158.82 = 917.05/x
3. Step 3: Cross multiply
   1,436.81x = 2,158.82 × 917.05
4. Step 4: Simplify right side
   1,436.81x = 1,979,745.88
5. Step 5: Solve for x
   x = 1,979,745.88/1,436.81
6. Step 6: Final answer
   x = 1,377.88