Finding the Fourth Proportional to 28,540.82, 42,823.53 and 15,390.15

Step by Step Solution

1. Step 1: Write the proportion equation
   28,540.82 : 42,823.53 = 15,390.15 : x
2. Step 2: Convert to fraction form
   28,540.82/42,823.53 = 15,390.15/x
3. Step 3: Cross multiply
   28,540.82x = 42,823.53 × 15,390.15
4. Step 4: Simplify right side
   28,540.82x = 659,060,550.23
5. Step 5: Solve for x
   x = 659,060,550.23/28,540.82
6. Step 6: Final answer
   x = 23,091.86