Finding the Fourth Proportional to 80,905.89, 111,647.55 and 50,707.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,905.89 : 111,647.55 = 50,707.50 : x
2. Step 2: Convert to fraction form
   80,905.89/111,647.55 = 50,707.50/x
3. Step 3: Cross multiply
   80,905.89x = 111,647.55 × 50,707.50
4. Step 4: Simplify right side
   80,905.89x = 5,661,368,141.63
5. Step 5: Solve for x
   x = 5,661,368,141.63/80,905.89
6. Step 6: Final answer
   x = 69,974.73