Finding the Fourth Proportional to 1,389.95, 1,918.23 and 760.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.95 : 1,918.23 = 760.47 : x
2. Step 2: Convert to fraction form
   1,389.95/1,918.23 = 760.47/x
3. Step 3: Cross multiply
   1,389.95x = 1,918.23 × 760.47
4. Step 4: Simplify right side
   1,389.95x = 1,458,756.37
5. Step 5: Solve for x
   x = 1,458,756.37/1,389.95
6. Step 6: Final answer
   x = 1,049.51