Finding the Fourth Proportional to 20,878.98, 31,320.27 and 5,296.61

Step by Step Solution

1. Step 1: Write the proportion equation
   20,878.98 : 31,320.27 = 5,296.61 : x
2. Step 2: Convert to fraction form
   20,878.98/31,320.27 = 5,296.61/x
3. Step 3: Cross multiply
   20,878.98x = 31,320.27 × 5,296.61
4. Step 4: Simplify right side
   20,878.98x = 165,891,098.68
5. Step 5: Solve for x
   x = 165,891,098.68/20,878.98
6. Step 6: Final answer
   x = 7,945.36