Finding the Fourth Proportional to 139,293.89, 192,242.56 and 81,930.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,293.89 : 192,242.56 = 81,930.47 : x
2. Step 2: Convert to fraction form
   139,293.89/192,242.56 = 81,930.47/x
3. Step 3: Cross multiply
   139,293.89x = 192,242.56 × 81,930.47
4. Step 4: Simplify right side
   139,293.89x = 15,750,523,570.58
5. Step 5: Solve for x
   x = 15,750,523,570.58/139,293.89
6. Step 6: Final answer
   x = 113,074.05