Finding the Fourth Proportional to 2,659.01, 3,988.41 and 1,428.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.01 : 3,988.41 = 1,428.81 : x
2. Step 2: Convert to fraction form
   2,659.01/3,988.41 = 1,428.81/x
3. Step 3: Cross multiply
   2,659.01x = 3,988.41 × 1,428.81
4. Step 4: Simplify right side
   2,659.01x = 5,698,680.09
5. Step 5: Solve for x
   x = 5,698,680.09/2,659.01
6. Step 6: Final answer
   x = 2,143.16