Finding the Fourth Proportional to 1,912.05, 2,636.82 and 1,281.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.05 : 2,636.82 = 1,281.87 : x
2. Step 2: Convert to fraction form
   1,912.05/2,636.82 = 1,281.87/x
3. Step 3: Cross multiply
   1,912.05x = 2,636.82 × 1,281.87
4. Step 4: Simplify right side
   1,912.05x = 3,380,060.45
5. Step 5: Solve for x
   x = 3,380,060.45/1,912.05
6. Step 6: Final answer
   x = 1,767.77