Finding the Fourth Proportional to 1,019.39, 1,520.25 and 994.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.39 : 1,520.25 = 994.55 : x
2. Step 2: Convert to fraction form
   1,019.39/1,520.25 = 994.55/x
3. Step 3: Cross multiply
   1,019.39x = 1,520.25 × 994.55
4. Step 4: Simplify right side
   1,019.39x = 1,511,953.31
5. Step 5: Solve for x
   x = 1,511,953.31/1,019.39
6. Step 6: Final answer
   x = 1,483.20