Finding the Fourth Proportional to 139,969.09, 209,989.83 and 40,136.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139,969.09 : 209,989.83 = 40,136.59 : x
2. Step 2: Convert to fraction form
   139,969.09/209,989.83 = 40,136.59/x
3. Step 3: Cross multiply
   139,969.09x = 209,989.83 × 40,136.59
4. Step 4: Simplify right side
   139,969.09x = 8,428,275,710.88
5. Step 5: Solve for x
   x = 8,428,275,710.88/139,969.09
6. Step 6: Final answer
   x = 60,215.26