Finding the Fourth Proportional to 139,879.05, 209,851.37 and 55,644

Step by Step Solution

1. Step 1: Write the proportion equation
   139,879.05 : 209,851.37 = 55,644 : x
2. Step 2: Convert to fraction form
   139,879.05/209,851.37 = 55,644/x
3. Step 3: Cross multiply
   139,879.05x = 209,851.37 × 55,644
4. Step 4: Simplify right side
   139,879.05x = 11,676,969,632.28
5. Step 5: Solve for x
   x = 11,676,969,632.28/139,879.05
6. Step 6: Final answer
   x = 83,479.05