Finding the Fourth Proportional to 2,159.39, 2,979.99 and 1,227.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.39 : 2,979.99 = 1,227.89 : x
2. Step 2: Convert to fraction form
   2,159.39/2,979.99 = 1,227.89/x
3. Step 3: Cross multiply
   2,159.39x = 2,979.99 × 1,227.89
4. Step 4: Simplify right side
   2,159.39x = 3,659,085.02
5. Step 5: Solve for x
   x = 3,659,085.02/2,159.39
6. Step 6: Final answer
   x = 1,694.50