Finding the Fourth Proportional to 1,391.48, 1,918.01 and 943.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.48 : 1,918.01 = 943.20 : x
2. Step 2: Convert to fraction form
   1,391.48/1,918.01 = 943.20/x
3. Step 3: Cross multiply
   1,391.48x = 1,918.01 × 943.20
4. Step 4: Simplify right side
   1,391.48x = 1,809,062.32
5. Step 5: Solve for x
   x = 1,809,062.32/1,391.48
6. Step 6: Final answer
   x = 1,300.10