Finding the Fourth Proportional to 1,659.60, 2,488.17 and 1,431.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.60 : 2,488.17 = 1,431.18 : x
2. Step 2: Convert to fraction form
   1,659.60/2,488.17 = 1,431.18/x
3. Step 3: Cross multiply
   1,659.60x = 2,488.17 × 1,431.18
4. Step 4: Simplify right side
   1,659.60x = 3,561,019.14
5. Step 5: Solve for x
   x = 3,561,019.14/1,659.60
6. Step 6: Final answer
   x = 2,145.71