Finding the Fourth Proportional to 3,388.52, 5,079.18 and 1,439.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,388.52 : 5,079.18 = 1,439.72 : x
2. Step 2: Convert to fraction form
   3,388.52/5,079.18 = 1,439.72/x
3. Step 3: Cross multiply
   3,388.52x = 5,079.18 × 1,439.72
4. Step 4: Simplify right side
   3,388.52x = 7,312,597.03
5. Step 5: Solve for x
   x = 7,312,597.03/3,388.52
6. Step 6: Final answer
   x = 2,158.05