Finding the Fourth Proportional to 2,157.89, 2,976.02 and 1,685.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.89 : 2,976.02 = 1,685.05 : x
2. Step 2: Convert to fraction form
   2,157.89/2,976.02 = 1,685.05/x
3. Step 3: Cross multiply
   2,157.89x = 2,976.02 × 1,685.05
4. Step 4: Simplify right side
   2,157.89x = 5,014,726.64
5. Step 5: Solve for x
   x = 5,014,726.64/2,157.89
6. Step 6: Final answer
   x = 2,323.91