Finding the Fourth Proportional to 139,569.57, 209,187.59 and 50,719.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,569.57 : 209,187.59 = 50,719.05 : x
2. Step 2: Convert to fraction form
   139,569.57/209,187.59 = 50,719.05/x
3. Step 3: Cross multiply
   139,569.57x = 209,187.59 × 50,719.05
4. Step 4: Simplify right side
   139,569.57x = 10,609,795,582.99
5. Step 5: Solve for x
   x = 10,609,795,582.99/139,569.57
6. Step 6: Final answer
   x = 76,017.97