Finding the Fourth Proportional to 139,433.16, 209,057.28 and 50,676.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,433.16 : 209,057.28 = 50,676.12 : x
2. Step 2: Convert to fraction form
   139,433.16/209,057.28 = 50,676.12/x
3. Step 3: Cross multiply
   139,433.16x = 209,057.28 × 50,676.12
4. Step 4: Simplify right side
   139,433.16x = 10,594,211,808.15
5. Step 5: Solve for x
   x = 10,594,211,808.15/139,433.16
6. Step 6: Final answer
   x = 75,980.58