Finding the Fourth Proportional to 139,815.41, 192,958.67 and 86,131.85

Step by Step Solution

1. Step 1: Write the proportion equation
   139,815.41 : 192,958.67 = 86,131.85 : x
2. Step 2: Convert to fraction form
   139,815.41/192,958.67 = 86,131.85/x
3. Step 3: Cross multiply
   139,815.41x = 192,958.67 × 86,131.85
4. Step 4: Simplify right side
   139,815.41x = 16,619,886,471.18
5. Step 5: Solve for x
   x = 16,619,886,471.18/139,815.41
6. Step 6: Final answer
   x = 118,870.21