Finding the Fourth Proportional to 30,875.35, 42,608.05 and 16,728.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,875.35 : 42,608.05 = 16,728.20 : x
2. Step 2: Convert to fraction form
   30,875.35/42,608.05 = 16,728.20/x
3. Step 3: Cross multiply
   30,875.35x = 42,608.05 × 16,728.20
4. Step 4: Simplify right side
   30,875.35x = 712,755,982.01
5. Step 5: Solve for x
   x = 712,755,982.01/30,875.35
6. Step 6: Final answer
   x = 23,084.95