Finding the Fourth Proportional to 2,108.15, 2,905.37 and 1,689.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.15 : 2,905.37 = 1,689.89 : x
2. Step 2: Convert to fraction form
   2,108.15/2,905.37 = 1,689.89/x
3. Step 3: Cross multiply
   2,108.15x = 2,905.37 × 1,689.89
4. Step 4: Simplify right side
   2,108.15x = 4,909,739.07
5. Step 5: Solve for x
   x = 4,909,739.07/2,108.15
6. Step 6: Final answer
   x = 2,328.93