Finding the Fourth Proportional to 40,982.72, 61,473.72 and 13,280.72

Step by Step Solution

1. Step 1: Write the proportion equation
   40,982.72 : 61,473.72 = 13,280.72 : x
2. Step 2: Convert to fraction form
   40,982.72/61,473.72 = 13,280.72/x
3. Step 3: Cross multiply
   40,982.72x = 61,473.72 × 13,280.72
4. Step 4: Simplify right side
   40,982.72x = 816,415,262.68
5. Step 5: Solve for x
   x = 816,415,262.68/40,982.72
6. Step 6: Final answer
   x = 19,920.96