Finding the Fourth Proportional to 70,912.72, 106,391.37 and 20,993.25

Step by Step Solution

1. Step 1: Write the proportion equation
   70,912.72 : 106,391.37 = 20,993.25 : x
2. Step 2: Convert to fraction form
   70,912.72/106,391.37 = 20,993.25/x
3. Step 3: Cross multiply
   70,912.72x = 106,391.37 × 20,993.25
4. Step 4: Simplify right side
   70,912.72x = 2,233,500,806.72
5. Step 5: Solve for x
   x = 2,233,500,806.72/70,912.72
6. Step 6: Final answer
   x = 31,496.48