Finding the Fourth Proportional to 139,605.66, 209,464.56 and 50,865.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,605.66 : 209,464.56 = 50,865.30 : x
2. Step 2: Convert to fraction form
   139,605.66/209,464.56 = 50,865.30/x
3. Step 3: Cross multiply
   139,605.66x = 209,464.56 × 50,865.30
4. Step 4: Simplify right side
   139,605.66x = 10,654,477,683.77
5. Step 5: Solve for x
   x = 10,654,477,683.77/139,605.66
6. Step 6: Final answer
   x = 76,318.38