Finding the Fourth Proportional to 9,424.12, 12,991.38 and 7,182.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,424.12 : 12,991.38 = 7,182.10 : x
2. Step 2: Convert to fraction form
   9,424.12/12,991.38 = 7,182.10/x
3. Step 3: Cross multiply
   9,424.12x = 12,991.38 × 7,182.10
4. Step 4: Simplify right side
   9,424.12x = 93,305,390.30
5. Step 5: Solve for x
   x = 93,305,390.30/9,424.12
6. Step 6: Final answer
   x = 9,900.70