Finding the Fourth Proportional to 20,900.36, 31,350.74 and 5,317.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,900.36 : 31,350.74 = 5,317.98 : x
2. Step 2: Convert to fraction form
   20,900.36/31,350.74 = 5,317.98/x
3. Step 3: Cross multiply
   20,900.36x = 31,350.74 × 5,317.98
4. Step 4: Simplify right side
   20,900.36x = 166,722,581.72
5. Step 5: Solve for x
   x = 166,722,581.72/20,900.36
6. Step 6: Final answer
   x = 7,977.02