Finding the Fourth Proportional to 30,780, 42,480.54 and 17,353.98

Step by Step Solution

1. Step 1: Write the proportion equation
   30,780 : 42,480.54 = 17,353.98 : x
2. Step 2: Convert to fraction form
   30,780/42,480.54 = 17,353.98/x
3. Step 3: Cross multiply
   30,780x = 42,480.54 × 17,353.98
4. Step 4: Simplify right side
   30,780x = 737,206,441.55
5. Step 5: Solve for x
   x = 737,206,441.55/30,780
6. Step 6: Final answer
   x = 23,950.83