Finding the Fourth Proportional to 139,749.30, 209,186.55 and 100,383.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,749.30 : 209,186.55 = 100,383.30 : x
2. Step 2: Convert to fraction form
   139,749.30/209,186.55 = 100,383.30/x
3. Step 3: Cross multiply
   139,749.30x = 209,186.55 × 100,383.30
4. Step 4: Simplify right side
   139,749.30x = 20,998,836,204.62
5. Step 5: Solve for x
   x = 20,998,836,204.62/139,749.30
6. Step 6: Final answer
   x = 150,260.76