Finding the Fourth Proportional to 28,388.55, 42,589.49 and 8,667.11

Step by Step Solution

1. Step 1: Write the proportion equation
   28,388.55 : 42,589.49 = 8,667.11 : x
2. Step 2: Convert to fraction form
   28,388.55/42,589.49 = 8,667.11/x
3. Step 3: Cross multiply
   28,388.55x = 42,589.49 × 8,667.11
4. Step 4: Simplify right side
   28,388.55x = 369,127,857.81
5. Step 5: Solve for x
   x = 369,127,857.81/28,388.55
6. Step 6: Final answer
   x = 13,002.70