Finding the Fourth Proportional to 2,087.72, 3,132.65 and 918.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.72 : 3,132.65 = 918.54 : x
2. Step 2: Convert to fraction form
   2,087.72/3,132.65 = 918.54/x
3. Step 3: Cross multiply
   2,087.72x = 3,132.65 × 918.54
4. Step 4: Simplify right side
   2,087.72x = 2,877,464.33
5. Step 5: Solve for x
   x = 2,877,464.33/2,087.72
6. Step 6: Final answer
   x = 1,378.28