Finding the Fourth Proportional to 30,678, 42,318.32 and 19,328

Step by Step Solution

1. Step 1: Write the proportion equation
   30,678 : 42,318.32 = 19,328 : x
2. Step 2: Convert to fraction form
   30,678/42,318.32 = 19,328/x
3. Step 3: Cross multiply
   30,678x = 42,318.32 × 19,328
4. Step 4: Simplify right side
   30,678x = 817,928,488.96
5. Step 5: Solve for x
   x = 817,928,488.96/30,678
6. Step 6: Final answer
   x = 26,661.73