Finding the Fourth Proportional to 139,707.20, 209,562.73 and 39,867.37

Step by Step Solution

1. Step 1: Write the proportion equation
   139,707.20 : 209,562.73 = 39,867.37 : x
2. Step 2: Convert to fraction form
   139,707.20/209,562.73 = 39,867.37/x
3. Step 3: Cross multiply
   139,707.20x = 209,562.73 × 39,867.37
4. Step 4: Simplify right side
   139,707.20x = 8,354,714,271.54
5. Step 5: Solve for x
   x = 8,354,714,271.54/139,707.20
6. Step 6: Final answer
   x = 59,801.60