Finding the Fourth Proportional to 120,834.72, 181,615.67 and 99,908.77

Step by Step Solution

1. Step 1: Write the proportion equation
   120,834.72 : 181,615.67 = 99,908.77 : x
2. Step 2: Convert to fraction form
   120,834.72/181,615.67 = 99,908.77/x
3. Step 3: Cross multiply
   120,834.72x = 181,615.67 × 99,908.77
4. Step 4: Simplify right side
   120,834.72x = 18,144,998,202.43
5. Step 5: Solve for x
   x = 18,144,998,202.43/120,834.72
6. Step 6: Final answer
   x = 150,163.78