Finding the Fourth Proportional to 30,906.21, 42,647.91 and 17,478.03

Step by Step Solution

1. Step 1: Write the proportion equation
   30,906.21 : 42,647.91 = 17,478.03 : x
2. Step 2: Convert to fraction form
   30,906.21/42,647.91 = 17,478.03/x
3. Step 3: Cross multiply
   30,906.21x = 42,647.91 × 17,478.03
4. Step 4: Simplify right side
   30,906.21x = 745,401,450.42
5. Step 5: Solve for x
   x = 745,401,450.42/30,906.21
6. Step 6: Final answer
   x = 24,118.18