Finding the Fourth Proportional to 1,439.52, 1,986.52 and 818.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.52 : 1,986.52 = 818.48 : x
2. Step 2: Convert to fraction form
   1,439.52/1,986.52 = 818.48/x
3. Step 3: Cross multiply
   1,439.52x = 1,986.52 × 818.48
4. Step 4: Simplify right side
   1,439.52x = 1,625,926.89
5. Step 5: Solve for x
   x = 1,625,926.89/1,439.52
6. Step 6: Final answer
   x = 1,129.49