Finding the Fourth Proportional to 15,540.78, 21,436.83 and 9,942.06

Step by Step Solution

1. Step 1: Write the proportion equation
   15,540.78 : 21,436.83 = 9,942.06 : x
2. Step 2: Convert to fraction form
   15,540.78/21,436.83 = 9,942.06/x
3. Step 3: Cross multiply
   15,540.78x = 21,436.83 × 9,942.06
4. Step 4: Simplify right side
   15,540.78x = 213,126,250.07
5. Step 5: Solve for x
   x = 213,126,250.07/15,540.78
6. Step 6: Final answer
   x = 13,714.00