Finding the Fourth Proportional to 139,123.20, 208,635.24 and 50,353.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,123.20 : 208,635.24 = 50,353.68 : x
2. Step 2: Convert to fraction form
   139,123.20/208,635.24 = 50,353.68/x
3. Step 3: Cross multiply
   139,123.20x = 208,635.24 × 50,353.68
4. Step 4: Simplify right side
   139,123.20x = 10,505,552,111.68
5. Step 5: Solve for x
   x = 10,505,552,111.68/139,123.20
6. Step 6: Final answer
   x = 75,512.58