Finding the Fourth Proportional to 3,686.94, 5,085.72 and 2,691

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686.94 : 5,085.72 = 2,691 : x
2. Step 2: Convert to fraction form
   3,686.94/5,085.72 = 2,691/x
3. Step 3: Cross multiply
   3,686.94x = 5,085.72 × 2,691
4. Step 4: Simplify right side
   3,686.94x = 13,685,672.52
5. Step 5: Solve for x
   x = 13,685,672.52/3,686.94
6. Step 6: Final answer
   x = 3,711.93