Finding the Fourth Proportional to 2,087.72, 2,881.32 and 1,912.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.72 : 2,881.32 = 1,912.76 : x
2. Step 2: Convert to fraction form
   2,087.72/2,881.32 = 1,912.76/x
3. Step 3: Cross multiply
   2,087.72x = 2,881.32 × 1,912.76
4. Step 4: Simplify right side
   2,087.72x = 5,511,273.64
5. Step 5: Solve for x
   x = 5,511,273.64/2,087.72
6. Step 6: Final answer
   x = 2,639.85