Finding the Fourth Proportional to 30,906.18, 42,647.70 and 17,478.60

Step by Step Solution

1. Step 1: Write the proportion equation
   30,906.18 : 42,647.70 = 17,478.60 : x
2. Step 2: Convert to fraction form
   30,906.18/42,647.70 = 17,478.60/x
3. Step 3: Cross multiply
   30,906.18x = 42,647.70 × 17,478.60
4. Step 4: Simplify right side
   30,906.18x = 745,422,089.22
5. Step 5: Solve for x
   x = 745,422,089.22/30,906.18
6. Step 6: Final answer
   x = 24,118.87