Finding the Fourth Proportional to 120,141.81, 181,023.71 and 99,540.27

Step by Step Solution

1. Step 1: Write the proportion equation
   120,141.81 : 181,023.71 = 99,540.27 : x
2. Step 2: Convert to fraction form
   120,141.81/181,023.71 = 99,540.27/x
3. Step 3: Cross multiply
   120,141.81x = 181,023.71 × 99,540.27
4. Step 4: Simplify right side
   120,141.81x = 18,019,148,472.10
5. Step 5: Solve for x
   x = 18,019,148,472.10/120,141.81
6. Step 6: Final answer
   x = 149,982.33