Finding the Fourth Proportional to 139,843.98, 209,599.38 and 80,556.84

Step by Step Solution

1. Step 1: Write the proportion equation
   139,843.98 : 209,599.38 = 80,556.84 : x
2. Step 2: Convert to fraction form
   139,843.98/209,599.38 = 80,556.84/x
3. Step 3: Cross multiply
   139,843.98x = 209,599.38 × 80,556.84
4. Step 4: Simplify right side
   139,843.98x = 16,884,663,718.76
5. Step 5: Solve for x
   x = 16,884,663,718.76/139,843.98
6. Step 6: Final answer
   x = 120,739.30