Finding the Fourth Proportional to 139,383.95, 209,067.46 and 49,431.13

Step by Step Solution

1. Step 1: Write the proportion equation
   139,383.95 : 209,067.46 = 49,431.13 : x
2. Step 2: Convert to fraction form
   139,383.95/209,067.46 = 49,431.13/x
3. Step 3: Cross multiply
   139,383.95x = 209,067.46 × 49,431.13
4. Step 4: Simplify right side
   139,383.95x = 10,334,440,147.78
5. Step 5: Solve for x
   x = 10,334,440,147.78/139,383.95
6. Step 6: Final answer
   x = 74,143.69