Finding the Fourth Proportional to 10,866.34, 16,287.85 and 7,116.67

Step by Step Solution

1. Step 1: Write the proportion equation
   10,866.34 : 16,287.85 = 7,116.67 : x
2. Step 2: Convert to fraction form
   10,866.34/16,287.85 = 7,116.67/x
3. Step 3: Cross multiply
   10,866.34x = 16,287.85 × 7,116.67
4. Step 4: Simplify right side
   10,866.34x = 115,915,253.46
5. Step 5: Solve for x
   x = 115,915,253.46/10,866.34
6. Step 6: Final answer
   x = 10,667.37