Finding the Fourth Proportional to 139,288.72, 208,964.07 and 50,540.26

Step by Step Solution

1. Step 1: Write the proportion equation
   139,288.72 : 208,964.07 = 50,540.26 : x
2. Step 2: Convert to fraction form
   139,288.72/208,964.07 = 50,540.26/x
3. Step 3: Cross multiply
   139,288.72x = 208,964.07 × 50,540.26
4. Step 4: Simplify right side
   139,288.72x = 10,561,098,428.46
5. Step 5: Solve for x
   x = 10,561,098,428.46/139,288.72
6. Step 6: Final answer
   x = 75,821.63