Finding the Fourth Proportional to 139,768.81, 192,875.72 and 85,411.87

Step by Step Solution

1. Step 1: Write the proportion equation
   139,768.81 : 192,875.72 = 85,411.87 : x
2. Step 2: Convert to fraction form
   139,768.81/192,875.72 = 85,411.87/x
3. Step 3: Cross multiply
   139,768.81x = 192,875.72 × 85,411.87
4. Step 4: Simplify right side
   139,768.81x = 16,473,875,013.55
5. Step 5: Solve for x
   x = 16,473,875,013.55/139,768.81
6. Step 6: Final answer
   x = 117,865.18