Finding the Fourth Proportional to 30,921.38, 42,671.52 and 16,774.28

Step by Step Solution

1. Step 1: Write the proportion equation
   30,921.38 : 42,671.52 = 16,774.28 : x
2. Step 2: Convert to fraction form
   30,921.38/42,671.52 = 16,774.28/x
3. Step 3: Cross multiply
   30,921.38x = 42,671.52 × 16,774.28
4. Step 4: Simplify right side
   30,921.38x = 715,783,811.15
5. Step 5: Solve for x
   x = 715,783,811.15/30,921.38
6. Step 6: Final answer
   x = 23,148.51