Finding the Fourth Proportional to 2,087.91, 3,131.69 and 1,265.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.91 : 3,131.69 = 1,265.94 : x
2. Step 2: Convert to fraction form
   2,087.91/3,131.69 = 1,265.94/x
3. Step 3: Cross multiply
   2,087.91x = 3,131.69 × 1,265.94
4. Step 4: Simplify right side
   2,087.91x = 3,964,525.31
5. Step 5: Solve for x
   x = 3,964,525.31/2,087.91
6. Step 6: Final answer
   x = 1,898.80