Finding the Fourth Proportional to 28,389.93, 42,591.56 and 8,668.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,389.93 : 42,591.56 = 8,668.50 : x
2. Step 2: Convert to fraction form
   28,389.93/42,591.56 = 8,668.50/x
3. Step 3: Cross multiply
   28,389.93x = 42,591.56 × 8,668.50
4. Step 4: Simplify right side
   28,389.93x = 369,204,937.86
5. Step 5: Solve for x
   x = 369,204,937.86/28,389.93
6. Step 6: Final answer
   x = 13,004.79