Finding the Fourth Proportional to 2,158.34, 2,976.20 and 1,659.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.34 : 2,976.20 = 1,659.90 : x
2. Step 2: Convert to fraction form
   2,158.34/2,976.20 = 1,659.90/x
3. Step 3: Cross multiply
   2,158.34x = 2,976.20 × 1,659.90
4. Step 4: Simplify right side
   2,158.34x = 4,940,194.38
5. Step 5: Solve for x
   x = 4,940,194.38/2,158.34
6. Step 6: Final answer
   x = 2,288.89