Finding the Fourth Proportional to 20,680.84, 31,018.90 and 5,689.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,680.84 : 31,018.90 = 5,689.56 : x
2. Step 2: Convert to fraction form
   20,680.84/31,018.90 = 5,689.56/x
3. Step 3: Cross multiply
   20,680.84x = 31,018.90 × 5,689.56
4. Step 4: Simplify right side
   20,680.84x = 176,483,892.68
5. Step 5: Solve for x
   x = 176,483,892.68/20,680.84
6. Step 6: Final answer
   x = 8,533.69