Finding the Fourth Proportional to 30,447.81, 42,019.94 and 17,019.11

Step by Step Solution

1. Step 1: Write the proportion equation
   30,447.81 : 42,019.94 = 17,019.11 : x
2. Step 2: Convert to fraction form
   30,447.81/42,019.94 = 17,019.11/x
3. Step 3: Cross multiply
   30,447.81x = 42,019.94 × 17,019.11
4. Step 4: Simplify right side
   30,447.81x = 715,141,981.05
5. Step 5: Solve for x
   x = 715,141,981.05/30,447.81
6. Step 6: Final answer
   x = 23,487.47