Finding the Fourth Proportional to 139,057.74, 208,462.90 and 50,291.51

Step by Step Solution

1. Step 1: Write the proportion equation
   139,057.74 : 208,462.90 = 50,291.51 : x
2. Step 2: Convert to fraction form
   139,057.74/208,462.90 = 50,291.51/x
3. Step 3: Cross multiply
   139,057.74x = 208,462.90 × 50,291.51
4. Step 4: Simplify right side
   139,057.74x = 10,483,912,851.94
5. Step 5: Solve for x
   x = 10,483,912,851.94/139,057.74
6. Step 6: Final answer
   x = 75,392.52