Finding the Fourth Proportional to 1,392.42, 1,918.90 and 1,019.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.42 : 1,918.90 = 1,019.52 : x
2. Step 2: Convert to fraction form
   1,392.42/1,918.90 = 1,019.52/x
3. Step 3: Cross multiply
   1,392.42x = 1,918.90 × 1,019.52
4. Step 4: Simplify right side
   1,392.42x = 1,956,356.93
5. Step 5: Solve for x
   x = 1,956,356.93/1,392.42
6. Step 6: Final answer
   x = 1,405.00