Finding the Fourth Proportional to 139,443.28, 209,159.40 and 120,662.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,443.28 : 209,159.40 = 120,662.38 : x
2. Step 2: Convert to fraction form
   139,443.28/209,159.40 = 120,662.38/x
3. Step 3: Cross multiply
   139,443.28x = 209,159.40 × 120,662.38
4. Step 4: Simplify right side
   139,443.28x = 25,237,671,003.37
5. Step 5: Solve for x
   x = 25,237,671,003.37/139,443.28
6. Step 6: Final answer
   x = 180,988.79