Finding the Fourth Proportional to 2,159.50, 2,980.12 and 1,228.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.50 : 2,980.12 = 1,228.18 : x
2. Step 2: Convert to fraction form
   2,159.50/2,980.12 = 1,228.18/x
3. Step 3: Cross multiply
   2,159.50x = 2,980.12 × 1,228.18
4. Step 4: Simplify right side
   2,159.50x = 3,660,123.78
5. Step 5: Solve for x
   x = 3,660,123.78/2,159.50
6. Step 6: Final answer
   x = 1,694.89