Finding the Fourth Proportional to 139,166.58, 208,749.33 and 50,399.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,166.58 : 208,749.33 = 50,399.31 : x
2. Step 2: Convert to fraction form
   139,166.58/208,749.33 = 50,399.31/x
3. Step 3: Cross multiply
   139,166.58x = 208,749.33 × 50,399.31
4. Step 4: Simplify right side
   139,166.58x = 10,520,822,194.96
5. Step 5: Solve for x
   x = 10,520,822,194.96/139,166.58
6. Step 6: Final answer
   x = 75,598.77