Finding the Fourth Proportional to 144,770.25, 199,791.15 and 81,128.55

Step by Step Solution

1. Step 1: Write the proportion equation
   144,770.25 : 199,791.15 = 81,128.55 : x
2. Step 2: Convert to fraction form
   144,770.25/199,791.15 = 81,128.55/x
3. Step 3: Cross multiply
   144,770.25x = 199,791.15 × 81,128.55
4. Step 4: Simplify right side
   144,770.25x = 16,208,766,302.33
5. Step 5: Solve for x
   x = 16,208,766,302.33/144,770.25
6. Step 6: Final answer
   x = 111,962.00