Finding the Fourth Proportional to 1,688.39, 2,329.98 and 942.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.39 : 2,329.98 = 942.31 : x
2. Step 2: Convert to fraction form
   1,688.39/2,329.98 = 942.31/x
3. Step 3: Cross multiply
   1,688.39x = 2,329.98 × 942.31
4. Step 4: Simplify right side
   1,688.39x = 2,195,563.45
5. Step 5: Solve for x
   x = 2,195,563.45/1,688.39
6. Step 6: Final answer
   x = 1,300.39