Finding the Fourth Proportional to 20,499.76, 30,759.36 and 12,196.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,499.76 : 30,759.36 = 12,196.18 : x
2. Step 2: Convert to fraction form
   20,499.76/30,759.36 = 12,196.18/x
3. Step 3: Cross multiply
   20,499.76x = 30,759.36 × 12,196.18
4. Step 4: Simplify right side
   20,499.76x = 375,146,691.24
5. Step 5: Solve for x
   x = 375,146,691.24/20,499.76
6. Step 6: Final answer
   x = 18,300.05