Finding the Fourth Proportional to 10,666.69, 14,723.10 and 7,140.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,666.69 : 14,723.10 = 7,140.15 : x
2. Step 2: Convert to fraction form
   10,666.69/14,723.10 = 7,140.15/x
3. Step 3: Cross multiply
   10,666.69x = 14,723.10 × 7,140.15
4. Step 4: Simplify right side
   10,666.69x = 105,125,142.47
5. Step 5: Solve for x
   x = 105,125,142.47/10,666.69
6. Step 6: Final answer
   x = 9,855.46