Finding the Fourth Proportional to 139,704.57, 192,796.49 and 86,020.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,704.57 : 192,796.49 = 86,020.56 : x
2. Step 2: Convert to fraction form
   139,704.57/192,796.49 = 86,020.56/x
3. Step 3: Cross multiply
   139,704.57x = 192,796.49 × 86,020.56
4. Step 4: Simplify right side
   139,704.57x = 16,584,462,250.89
5. Step 5: Solve for x
   x = 16,584,462,250.89/139,704.57
6. Step 6: Final answer
   x = 118,710.95