Finding the Fourth Proportional to 28,890.27, 39,865.37 and 16,315.02

Step by Step Solution

1. Step 1: Write the proportion equation
   28,890.27 : 39,865.37 = 16,315.02 : x
2. Step 2: Convert to fraction form
   28,890.27/39,865.37 = 16,315.02/x
3. Step 3: Cross multiply
   28,890.27x = 39,865.37 × 16,315.02
4. Step 4: Simplify right side
   28,890.27x = 650,404,227.28
5. Step 5: Solve for x
   x = 650,404,227.28/28,890.27
6. Step 6: Final answer
   x = 22,512.92