Finding the Fourth Proportional to 139,083.89, 208,711.49 and 54,829.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,083.89 : 208,711.49 = 54,829.72 : x
2. Step 2: Convert to fraction form
   139,083.89/208,711.49 = 54,829.72/x
3. Step 3: Cross multiply
   139,083.89x = 208,711.49 × 54,829.72
4. Step 4: Simplify right side
   139,083.89x = 11,443,591,513.93
5. Step 5: Solve for x
   x = 11,443,591,513.93/139,083.89
6. Step 6: Final answer
   x = 82,278.34