Finding the Fourth Proportional to 22,719.54, 31,357.49 and 13,161

Step by Step Solution

1. Step 1: Write the proportion equation
   22,719.54 : 31,357.49 = 13,161 : x
2. Step 2: Convert to fraction form
   22,719.54/31,357.49 = 13,161/x
3. Step 3: Cross multiply
   22,719.54x = 31,357.49 × 13,161
4. Step 4: Simplify right side
   22,719.54x = 412,695,925.89
5. Step 5: Solve for x
   x = 412,695,925.89/22,719.54
6. Step 6: Final answer
   x = 18,164.80