Finding the Fourth Proportional to 139,129.43, 208,710.78 and 49,153.51

Step by Step Solution

1. Step 1: Write the proportion equation
   139,129.43 : 208,710.78 = 49,153.51 : x
2. Step 2: Convert to fraction form
   139,129.43/208,710.78 = 49,153.51/x
3. Step 3: Cross multiply
   139,129.43x = 208,710.78 × 49,153.51
4. Step 4: Simplify right side
   139,129.43x = 10,258,867,488.40
5. Step 5: Solve for x
   x = 10,258,867,488.40/139,129.43
6. Step 6: Final answer
   x = 73,736.15