Finding the Fourth Proportional to 20,740.40, 31,110.71 and 5,158.02

Step by Step Solution

1. Step 1: Write the proportion equation
   20,740.40 : 31,110.71 = 5,158.02 : x
2. Step 2: Convert to fraction form
   20,740.40/31,110.71 = 5,158.02/x
3. Step 3: Cross multiply
   20,740.40x = 31,110.71 × 5,158.02
4. Step 4: Simplify right side
   20,740.40x = 160,469,755.27
5. Step 5: Solve for x
   x = 160,469,755.27/20,740.40
6. Step 6: Final answer
   x = 7,737.06