Finding the Fourth Proportional to 139,815.10, 192,953.91 and 83,218.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,815.10 : 192,953.91 = 83,218.78 : x
2. Step 2: Convert to fraction form
   139,815.10/192,953.91 = 83,218.78/x
3. Step 3: Cross multiply
   139,815.10x = 192,953.91 × 83,218.78
4. Step 4: Simplify right side
   139,815.10x = 16,057,388,986.43
5. Step 5: Solve for x
   x = 16,057,388,986.43/139,815.10
6. Step 6: Final answer
   x = 114,847.32