Finding the Fourth Proportional to 1,689.78, 2,331.90 and 943.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.78 : 2,331.90 = 943.69 : x
2. Step 2: Convert to fraction form
   1,689.78/2,331.90 = 943.69/x
3. Step 3: Cross multiply
   1,689.78x = 2,331.90 × 943.69
4. Step 4: Simplify right side
   1,689.78x = 2,200,590.71
5. Step 5: Solve for x
   x = 2,200,590.71/1,689.78
6. Step 6: Final answer
   x = 1,302.29