Finding the Fourth Proportional to 107,399.72, 161,087.12 and 28,520.12

Step by Step Solution

1. Step 1: Write the proportion equation
   107,399.72 : 161,087.12 = 28,520.12 : x
2. Step 2: Convert to fraction form
   107,399.72/161,087.12 = 28,520.12/x
3. Step 3: Cross multiply
   107,399.72x = 161,087.12 × 28,520.12
4. Step 4: Simplify right side
   107,399.72x = 4,594,223,992.85
5. Step 5: Solve for x
   x = 4,594,223,992.85/107,399.72
6. Step 6: Final answer
   x = 42,776.87