Finding the Fourth Proportional to 20,648.76, 28,501.82 and 13,196.76

Step by Step Solution

1. Step 1: Write the proportion equation
   20,648.76 : 28,501.82 = 13,196.76 : x
2. Step 2: Convert to fraction form
   20,648.76/28,501.82 = 13,196.76/x
3. Step 3: Cross multiply
   20,648.76x = 28,501.82 × 13,196.76
4. Step 4: Simplify right side
   20,648.76x = 376,131,678.10
5. Step 5: Solve for x
   x = 376,131,678.10/20,648.76
6. Step 6: Final answer
   x = 18,215.70