Finding the Fourth Proportional to 15,406.78, 22,998.69 and 13,538.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,406.78 : 22,998.69 = 13,538.42 : x
2. Step 2: Convert to fraction form
   15,406.78/22,998.69 = 13,538.42/x
3. Step 3: Cross multiply
   15,406.78x = 22,998.69 × 13,538.42
4. Step 4: Simplify right side
   15,406.78x = 311,365,924.67
5. Step 5: Solve for x
   x = 311,365,924.67/15,406.78
6. Step 6: Final answer
   x = 20,209.67