Finding the Fourth Proportional to 139,420.73, 209,131.79 and 34,239.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,420.73 : 209,131.79 = 34,239.71 : x
2. Step 2: Convert to fraction form
   139,420.73/209,131.79 = 34,239.71/x
3. Step 3: Cross multiply
   139,420.73x = 209,131.79 × 34,239.71
4. Step 4: Simplify right side
   139,420.73x = 7,160,610,624.52
5. Step 5: Solve for x
   x = 7,160,610,624.52/139,420.73
6. Step 6: Final answer
   x = 51,359.73