Finding the Fourth Proportional to 1,398.88, 1,930.43 and 760.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.88 : 1,930.43 = 760.81 : x
2. Step 2: Convert to fraction form
   1,398.88/1,930.43 = 760.81/x
3. Step 3: Cross multiply
   1,398.88x = 1,930.43 × 760.81
4. Step 4: Simplify right side
   1,398.88x = 1,468,690.45
5. Step 5: Solve for x
   x = 1,468,690.45/1,398.88
6. Step 6: Final answer
   x = 1,049.91