Finding the Fourth Proportional to 2,158.66, 2,980.62 and 1,685.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.66 : 2,980.62 = 1,685.73 : x
2. Step 2: Convert to fraction form
   2,158.66/2,980.62 = 1,685.73/x
3. Step 3: Cross multiply
   2,158.66x = 2,980.62 × 1,685.73
4. Step 4: Simplify right side
   2,158.66x = 5,024,532.28
5. Step 5: Solve for x
   x = 5,024,532.28/2,158.66
6. Step 6: Final answer
   x = 2,327.62