Finding the Fourth Proportional to 1,687.39, 2,328.60 and 941.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.39 : 2,328.60 = 941.31 : x
2. Step 2: Convert to fraction form
   1,687.39/2,328.60 = 941.31/x
3. Step 3: Cross multiply
   1,687.39x = 2,328.60 × 941.31
4. Step 4: Simplify right side
   1,687.39x = 2,191,929.43
5. Step 5: Solve for x
   x = 2,191,929.43/1,687.39
6. Step 6: Final answer
   x = 1,299.00