Finding the Fourth Proportional to 20,780.32, 31,170.72 and 5,989.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,780.32 : 31,170.72 = 5,989.48 : x
2. Step 2: Convert to fraction form
   20,780.32/31,170.72 = 5,989.48/x
3. Step 3: Cross multiply
   20,780.32x = 31,170.72 × 5,989.48
4. Step 4: Simplify right side
   20,780.32x = 186,696,404.03
5. Step 5: Solve for x
   x = 186,696,404.03/20,780.32
6. Step 6: Final answer
   x = 8,984.29