Finding the Fourth Proportional to 139,338.28, 209,025.60 and 50,578.84

Step by Step Solution

1. Step 1: Write the proportion equation
   139,338.28 : 209,025.60 = 50,578.84 : x
2. Step 2: Convert to fraction form
   139,338.28/209,025.60 = 50,578.84/x
3. Step 3: Cross multiply
   139,338.28x = 209,025.60 × 50,578.84
4. Step 4: Simplify right side
   139,338.28x = 10,572,272,378.30
5. Step 5: Solve for x
   x = 10,572,272,378.30/139,338.28
6. Step 6: Final answer
   x = 75,874.86