Finding the Fourth Proportional to 12,820.20, 17,685.56 and 9,982.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.20 : 17,685.56 = 9,982.52 : x
2. Step 2: Convert to fraction form
   12,820.20/17,685.56 = 9,982.52/x
3. Step 3: Cross multiply
   12,820.20x = 17,685.56 × 9,982.52
4. Step 4: Simplify right side
   12,820.20x = 176,546,456.41
5. Step 5: Solve for x
   x = 176,546,456.41/12,820.20
6. Step 6: Final answer
   x = 13,770.96