Finding the Fourth Proportional to 139,873.27, 209,561.16 and 80,586.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,873.27 : 209,561.16 = 80,586.46 : x
2. Step 2: Convert to fraction form
   139,873.27/209,561.16 = 80,586.46/x
3. Step 3: Cross multiply
   139,873.27x = 209,561.16 × 80,586.46
4. Step 4: Simplify right side
   139,873.27x = 16,887,792,037.89
5. Step 5: Solve for x
   x = 16,887,792,037.89/139,873.27
6. Step 6: Final answer
   x = 120,736.38