Finding the Fourth Proportional to 20,891.47, 31,336.69 and 5,096.61

Step by Step Solution

1. Step 1: Write the proportion equation
   20,891.47 : 31,336.69 = 5,096.61 : x
2. Step 2: Convert to fraction form
   20,891.47/31,336.69 = 5,096.61/x
3. Step 3: Cross multiply
   20,891.47x = 31,336.69 × 5,096.61
4. Step 4: Simplify right side
   20,891.47x = 159,710,887.62
5. Step 5: Solve for x
   x = 159,710,887.62/20,891.47
6. Step 6: Final answer
   x = 7,644.79