Finding the Fourth Proportional to 7,891.38, 10,866.42 and 7,179.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,891.38 : 10,866.42 = 7,179.12 : x
2. Step 2: Convert to fraction form
   7,891.38/10,866.42 = 7,179.12/x
3. Step 3: Cross multiply
   7,891.38x = 10,866.42 × 7,179.12
4. Step 4: Simplify right side
   7,891.38x = 78,011,333.15
5. Step 5: Solve for x
   x = 78,011,333.15/7,891.38
6. Step 6: Final answer
   x = 9,885.64