Finding the Fourth Proportional to 139,229.73, 208,868.28 and 54,945.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,229.73 : 208,868.28 = 54,945.78 : x
2. Step 2: Convert to fraction form
   139,229.73/208,868.28 = 54,945.78/x
3. Step 3: Cross multiply
   139,229.73x = 208,868.28 × 54,945.78
4. Step 4: Simplify right side
   139,229.73x = 11,476,430,561.86
5. Step 5: Solve for x
   x = 11,476,430,561.86/139,229.73
6. Step 6: Final answer
   x = 82,428.02