Finding the Fourth Proportional to 139,498.20, 209,231.10 and 39,673.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,498.20 : 209,231.10 = 39,673.80 : x
2. Step 2: Convert to fraction form
   139,498.20/209,231.10 = 39,673.80/x
3. Step 3: Cross multiply
   139,498.20x = 209,231.10 × 39,673.80
4. Step 4: Simplify right side
   139,498.20x = 8,300,992,815.18
5. Step 5: Solve for x
   x = 8,300,992,815.18/139,498.20
6. Step 6: Final answer
   x = 59,506.09