Finding the Fourth Proportional to 139,846.64, 209,788.25 and 51,141.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,846.64 : 209,788.25 = 51,141.92 : x
2. Step 2: Convert to fraction form
   139,846.64/209,788.25 = 51,141.92/x
3. Step 3: Cross multiply
   139,846.64x = 209,788.25 × 51,141.92
4. Step 4: Simplify right side
   139,846.64x = 10,728,972,593.79
5. Step 5: Solve for x
   x = 10,728,972,593.79/139,846.64
6. Step 6: Final answer
   x = 76,719.56