Finding the Fourth Proportional to 139,853.39, 209,798.37 and 51,148.67

Step by Step Solution

1. Step 1: Write the proportion equation
   139,853.39 : 209,798.37 = 51,148.67 : x
2. Step 2: Convert to fraction form
   139,853.39/209,798.37 = 51,148.67/x
3. Step 3: Cross multiply
   139,853.39x = 209,798.37 × 51,148.67
4. Step 4: Simplify right side
   139,853.39x = 10,730,906,544.68
5. Step 5: Solve for x
   x = 10,730,906,544.68/139,853.39
6. Step 6: Final answer
   x = 76,729.69