Finding the Fourth Proportional to 20,757.58, 31,003.96 and 18,780.15

Step by Step Solution

1. Step 1: Write the proportion equation
   20,757.58 : 31,003.96 = 18,780.15 : x
2. Step 2: Convert to fraction form
   20,757.58/31,003.96 = 18,780.15/x
3. Step 3: Cross multiply
   20,757.58x = 31,003.96 × 18,780.15
4. Step 4: Simplify right side
   20,757.58x = 582,259,019.39
5. Step 5: Solve for x
   x = 582,259,019.39/20,757.58
6. Step 6: Final answer
   x = 28,050.43