Finding the Fourth Proportional to 9,012.70, 12,429.75 and 8,487.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,012.70 : 12,429.75 = 8,487.82 : x
2. Step 2: Convert to fraction form
   9,012.70/12,429.75 = 8,487.82/x
3. Step 3: Cross multiply
   9,012.70x = 12,429.75 × 8,487.82
4. Step 4: Simplify right side
   9,012.70x = 105,501,480.65
5. Step 5: Solve for x
   x = 105,501,480.65/9,012.70
6. Step 6: Final answer
   x = 11,705.87