Finding the Fourth Proportional to 15,196.84, 20,961.40 and 13,203.98

Step by Step Solution

1. Step 1: Write the proportion equation
   15,196.84 : 20,961.40 = 13,203.98 : x
2. Step 2: Convert to fraction form
   15,196.84/20,961.40 = 13,203.98/x
3. Step 3: Cross multiply
   15,196.84x = 20,961.40 × 13,203.98
4. Step 4: Simplify right side
   15,196.84x = 276,773,906.37
5. Step 5: Solve for x
   x = 276,773,906.37/15,196.84
6. Step 6: Final answer
   x = 18,212.60