Finding the Fourth Proportional to 139,717.80, 192,706.56 and 88,686.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,717.80 : 192,706.56 = 88,686.18 : x
2. Step 2: Convert to fraction form
   139,717.80/192,706.56 = 88,686.18/x
3. Step 3: Cross multiply
   139,717.80x = 192,706.56 × 88,686.18
4. Step 4: Simplify right side
   139,717.80x = 17,090,408,667.34
5. Step 5: Solve for x
   x = 17,090,408,667.34/139,717.80
6. Step 6: Final answer
   x = 122,320.91