Finding the Fourth Proportional to 1,439.48, 1,986.50 and 818.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.48 : 1,986.50 = 818.52 : x
2. Step 2: Convert to fraction form
   1,439.48/1,986.50 = 818.52/x
3. Step 3: Cross multiply
   1,439.48x = 1,986.50 × 818.52
4. Step 4: Simplify right side
   1,439.48x = 1,625,989.98
5. Step 5: Solve for x
   x = 1,625,989.98/1,439.48
6. Step 6: Final answer
   x = 1,129.57