Finding the Fourth Proportional to 30,905.34, 42,650.20 and 17,478.60

Step by Step Solution

1. Step 1: Write the proportion equation
   30,905.34 : 42,650.20 = 17,478.60 : x
2. Step 2: Convert to fraction form
   30,905.34/42,650.20 = 17,478.60/x
3. Step 3: Cross multiply
   30,905.34x = 42,650.20 × 17,478.60
4. Step 4: Simplify right side
   30,905.34x = 745,465,785.72
5. Step 5: Solve for x
   x = 745,465,785.72/30,905.34
6. Step 6: Final answer
   x = 24,120.94