Finding the Fourth Proportional to 139,845.78, 209,581.83 and 51,015.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,845.78 : 209,581.83 = 51,015.78 : x
2. Step 2: Convert to fraction form
   139,845.78/209,581.83 = 51,015.78/x
3. Step 3: Cross multiply
   139,845.78x = 209,581.83 × 51,015.78
4. Step 4: Simplify right side
   139,845.78x = 10,691,980,531.28
5. Step 5: Solve for x
   x = 10,691,980,531.28/139,845.78
6. Step 6: Final answer
   x = 76,455.51