Finding the Fourth Proportional to 105,921.72, 146,172.33 and 58,173.84

Step by Step Solution

1. Step 1: Write the proportion equation
   105,921.72 : 146,172.33 = 58,173.84 : x
2. Step 2: Convert to fraction form
   105,921.72/146,172.33 = 58,173.84/x
3. Step 3: Cross multiply
   105,921.72x = 146,172.33 × 58,173.84
4. Step 4: Simplify right side
   105,921.72x = 8,503,405,737.85
5. Step 5: Solve for x
   x = 8,503,405,737.85/105,921.72
6. Step 6: Final answer
   x = 80,280.09