Finding the Fourth Proportional to 8,870.42, 12,231.06 and 6,628.52

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.42 : 12,231.06 = 6,628.52 : x
2. Step 2: Convert to fraction form
   8,870.42/12,231.06 = 6,628.52/x
3. Step 3: Cross multiply
   8,870.42x = 12,231.06 × 6,628.52
4. Step 4: Simplify right side
   8,870.42x = 81,073,825.83
5. Step 5: Solve for x
   x = 81,073,825.83/8,870.42
6. Step 6: Final answer
   x = 9,139.80