Finding the Fourth Proportional to 1,391.85, 1,918.52 and 943.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.85 : 1,918.52 = 943.58 : x
2. Step 2: Convert to fraction form
   1,391.85/1,918.52 = 943.58/x
3. Step 3: Cross multiply
   1,391.85x = 1,918.52 × 943.58
4. Step 4: Simplify right side
   1,391.85x = 1,810,262.79
5. Step 5: Solve for x
   x = 1,810,262.79/1,391.85
6. Step 6: Final answer
   x = 1,300.62