Finding the Fourth Proportional to 1,390.03, 1,918.14 and 760.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.03 : 1,918.14 = 760.42 : x
2. Step 2: Convert to fraction form
   1,390.03/1,918.14 = 760.42/x
3. Step 3: Cross multiply
   1,390.03x = 1,918.14 × 760.42
4. Step 4: Simplify right side
   1,390.03x = 1,458,592.02
5. Step 5: Solve for x
   x = 1,458,592.02/1,390.03
6. Step 6: Final answer
   x = 1,049.32