Finding the Fourth Proportional to 139,628.75, 209,574.34 and 73,116.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,628.75 : 209,574.34 = 73,116.61 : x
2. Step 2: Convert to fraction form
   139,628.75/209,574.34 = 73,116.61/x
3. Step 3: Cross multiply
   139,628.75x = 209,574.34 × 73,116.61
4. Step 4: Simplify right side
   139,628.75x = 15,323,365,923.89
5. Step 5: Solve for x
   x = 15,323,365,923.89/139,628.75
6. Step 6: Final answer
   x = 109,743.63