Finding the Fourth Proportional to 139,291.15, 209,019.72 and 50,551.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,291.15 : 209,019.72 = 50,551.57 : x
2. Step 2: Convert to fraction form
   139,291.15/209,019.72 = 50,551.57/x
3. Step 3: Cross multiply
   139,291.15x = 209,019.72 × 50,551.57
4. Step 4: Simplify right side
   139,291.15x = 10,566,274,610.79
5. Step 5: Solve for x
   x = 10,566,274,610.79/139,291.15
6. Step 6: Final answer
   x = 75,857.47