Finding the Fourth Proportional to 1,389.94, 1,918.10 and 760.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.94 : 1,918.10 = 760.48 : x
2. Step 2: Convert to fraction form
   1,389.94/1,918.10 = 760.48/x
3. Step 3: Cross multiply
   1,389.94x = 1,918.10 × 760.48
4. Step 4: Simplify right side
   1,389.94x = 1,458,676.69
5. Step 5: Solve for x
   x = 1,458,676.69/1,389.94
6. Step 6: Final answer
   x = 1,049.45