Finding the Fourth Proportional to 139,231.49, 208,813.77 and 64,279.62

Step by Step Solution

1. Step 1: Write the proportion equation
   139,231.49 : 208,813.77 = 64,279.62 : x
2. Step 2: Convert to fraction form
   139,231.49/208,813.77 = 64,279.62/x
3. Step 3: Cross multiply
   139,231.49x = 208,813.77 × 64,279.62
4. Step 4: Simplify right side
   139,231.49x = 13,422,469,786.37
5. Step 5: Solve for x
   x = 13,422,469,786.37/139,231.49
6. Step 6: Final answer
   x = 96,403.98