Finding the Fourth Proportional to 139,667.80, 192,745.90 and 79,240.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139,667.80 : 192,745.90 = 79,240.98 : x
2. Step 2: Convert to fraction form
   139,667.80/192,745.90 = 79,240.98/x
3. Step 3: Cross multiply
   139,667.80x = 192,745.90 × 79,240.98
4. Step 4: Simplify right side
   139,667.80x = 15,273,374,006.98
5. Step 5: Solve for x
   x = 15,273,374,006.98/139,667.80
6. Step 6: Final answer
   x = 109,355.01