Finding the Fourth Proportional to 139,561.21, 192,590.35 and 79,137.37

Step by Step Solution

1. Step 1: Write the proportion equation
   139,561.21 : 192,590.35 = 79,137.37 : x
2. Step 2: Convert to fraction form
   139,561.21/192,590.35 = 79,137.37/x
3. Step 3: Cross multiply
   139,561.21x = 192,590.35 × 79,137.37
4. Step 4: Simplify right side
   139,561.21x = 15,241,093,786.38
5. Step 5: Solve for x
   x = 15,241,093,786.38/139,561.21
6. Step 6: Final answer
   x = 109,207.23