Finding the Fourth Proportional to 1,689.69, 2,330.88 and 1,375.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.69 : 2,330.88 = 1,375.31 : x
2. Step 2: Convert to fraction form
   1,689.69/2,330.88 = 1,375.31/x
3. Step 3: Cross multiply
   1,689.69x = 2,330.88 × 1,375.31
4. Step 4: Simplify right side
   1,689.69x = 3,205,682.57
5. Step 5: Solve for x
   x = 3,205,682.57/1,689.69
6. Step 6: Final answer
   x = 1,897.20