Finding the Fourth Proportional to 3,139.05, 4,322.06 and 2,665.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.05 : 4,322.06 = 2,665.96 : x
2. Step 2: Convert to fraction form
   3,139.05/4,322.06 = 2,665.96/x
3. Step 3: Cross multiply
   3,139.05x = 4,322.06 × 2,665.96
4. Step 4: Simplify right side
   3,139.05x = 11,522,449.25
5. Step 5: Solve for x
   x = 11,522,449.25/3,139.05
6. Step 6: Final answer
   x = 3,670.68