Finding the Fourth Proportional to 20,860.79, 31,291.38 and 5,065.96

Step by Step Solution

1. Step 1: Write the proportion equation
   20,860.79 : 31,291.38 = 5,065.96 : x
2. Step 2: Convert to fraction form
   20,860.79/31,291.38 = 5,065.96/x
3. Step 3: Cross multiply
   20,860.79x = 31,291.38 × 5,065.96
4. Step 4: Simplify right side
   20,860.79x = 158,520,879.42
5. Step 5: Solve for x
   x = 158,520,879.42/20,860.79
6. Step 6: Final answer
   x = 7,598.99