Finding the Fourth Proportional to 3,709.31, 5,111.77 and 2,659.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,709.31 : 5,111.77 = 2,659.55 : x
2. Step 2: Convert to fraction form
   3,709.31/5,111.77 = 2,659.55/x
3. Step 3: Cross multiply
   3,709.31x = 5,111.77 × 2,659.55
4. Step 4: Simplify right side
   3,709.31x = 13,595,007.90
5. Step 5: Solve for x
   x = 13,595,007.90/3,709.31
6. Step 6: Final answer
   x = 3,665.10