Finding the Fourth Proportional to 144,139.84, 198,911.12 and 80,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   144,139.84 : 198,911.12 = 80,478.72 : x
2. Step 2: Convert to fraction form
   144,139.84/198,911.12 = 80,478.72/x
3. Step 3: Cross multiply
   144,139.84x = 198,911.12 × 80,478.72
4. Step 4: Simplify right side
   144,139.84x = 16,008,112,331.37
5. Step 5: Solve for x
   x = 16,008,112,331.37/144,139.84
6. Step 6: Final answer
   x = 111,059.60