Finding the Fourth Proportional to 139,790.82, 192,913.53 and 76,128.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139,790.82 : 192,913.53 = 76,128.54 : x
2. Step 2: Convert to fraction form
   139,790.82/192,913.53 = 76,128.54/x
3. Step 3: Cross multiply
   139,790.82x = 192,913.53 × 76,128.54
4. Step 4: Simplify right side
   139,790.82x = 14,686,225,385.15
5. Step 5: Solve for x
   x = 14,686,225,385.15/139,790.82
6. Step 6: Final answer
   x = 105,058.58