Finding the Fourth Proportional to 139,249.89, 192,264.71 and 85,606.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139,249.89 : 192,264.71 = 85,606.83 : x
2. Step 2: Convert to fraction form
   139,249.89/192,264.71 = 85,606.83/x
3. Step 3: Cross multiply
   139,249.89x = 192,264.71 × 85,606.83
4. Step 4: Simplify right side
   139,249.89x = 16,459,171,915.94
5. Step 5: Solve for x
   x = 16,459,171,915.94/139,249.89
6. Step 6: Final answer
   x = 118,198.81