Finding the Fourth Proportional to 139,739.81, 209,613.16 and 50,993.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,739.81 : 209,613.16 = 50,993.31 : x
2. Step 2: Convert to fraction form
   139,739.81/209,613.16 = 50,993.31/x
3. Step 3: Cross multiply
   139,739.81x = 209,613.16 × 50,993.31
4. Step 4: Simplify right side
   139,739.81x = 10,688,868,847.96
5. Step 5: Solve for x
   x = 10,688,868,847.96/139,739.81
6. Step 6: Final answer
   x = 76,491.22