Finding the Fourth Proportional to 30,728.01, 42,480.78 and 30,447.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,728.01 : 42,480.78 = 30,447.75 : x
2. Step 2: Convert to fraction form
   30,728.01/42,480.78 = 30,447.75/x
3. Step 3: Cross multiply
   30,728.01x = 42,480.78 × 30,447.75
4. Step 4: Simplify right side
   30,728.01x = 1,293,444,169.25
5. Step 5: Solve for x
   x = 1,293,444,169.25/30,728.01
6. Step 6: Final answer
   x = 42,093.33