Finding the Fourth Proportional to 139,072.46, 191,923.85 and 78,652.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,072.46 : 191,923.85 = 78,652.18 : x
2. Step 2: Convert to fraction form
   139,072.46/191,923.85 = 78,652.18/x
3. Step 3: Cross multiply
   139,072.46x = 191,923.85 × 78,652.18
4. Step 4: Simplify right side
   139,072.46x = 15,095,229,196.49
5. Step 5: Solve for x
   x = 15,095,229,196.49/139,072.46
6. Step 6: Final answer
   x = 108,542.19