Finding the Fourth Proportional to 72,418.89, 99,878.88 and 50,979.67

Step by Step Solution

1. Step 1: Write the proportion equation
   72,418.89 : 99,878.88 = 50,979.67 : x
2. Step 2: Convert to fraction form
   72,418.89/99,878.88 = 50,979.67/x
3. Step 3: Cross multiply
   72,418.89x = 99,878.88 × 50,979.67
4. Step 4: Simplify right side
   72,418.89x = 5,091,792,342.37
5. Step 5: Solve for x
   x = 5,091,792,342.37/72,418.89
6. Step 6: Final answer
   x = 70,310.28