Finding the Fourth Proportional to 139,640.82, 209,460.90 and 50,858.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,640.82 : 209,460.90 = 50,858.04 : x
2. Step 2: Convert to fraction form
   139,640.82/209,460.90 = 50,858.04/x
3. Step 3: Cross multiply
   139,640.82x = 209,460.90 × 50,858.04
4. Step 4: Simplify right side
   139,640.82x = 10,652,770,830.64
5. Step 5: Solve for x
   x = 10,652,770,830.64/139,640.82
6. Step 6: Final answer
   x = 76,286.94