Finding the Fourth Proportional to 20,900.48, 31,350.51 and 5,317.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,900.48 : 31,350.51 = 5,317.94 : x
2. Step 2: Convert to fraction form
   20,900.48/31,350.51 = 5,317.94/x
3. Step 3: Cross multiply
   20,900.48x = 31,350.51 × 5,317.94
4. Step 4: Simplify right side
   20,900.48x = 166,720,131.15
5. Step 5: Solve for x
   x = 166,720,131.15/20,900.48
6. Step 6: Final answer
   x = 7,976.86