Finding the Fourth Proportional to 139,190.23, 208,785.30 and 50,443.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,190.23 : 208,785.30 = 50,443.57 : x
2. Step 2: Convert to fraction form
   139,190.23/208,785.30 = 50,443.57/x
3. Step 3: Cross multiply
   139,190.23x = 208,785.30 × 50,443.57
4. Step 4: Simplify right side
   139,190.23x = 10,531,875,895.52
5. Step 5: Solve for x
   x = 10,531,875,895.52/139,190.23
6. Step 6: Final answer
   x = 75,665.34