Finding the Fourth Proportional to 139,688.94, 192,807.81 and 86,018.93

Step by Step Solution

1. Step 1: Write the proportion equation
   139,688.94 : 192,807.81 = 86,018.93 : x
2. Step 2: Convert to fraction form
   139,688.94/192,807.81 = 86,018.93/x
3. Step 3: Cross multiply
   139,688.94x = 192,807.81 × 86,018.93
4. Step 4: Simplify right side
   139,688.94x = 16,585,122,113.45
5. Step 5: Solve for x
   x = 16,585,122,113.45/139,688.94
6. Step 6: Final answer
   x = 118,728.96