Finding the Fourth Proportional to 9,012.56, 12,500.96 and 8,772.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,012.56 : 12,500.96 = 8,772.80 : x
2. Step 2: Convert to fraction form
   9,012.56/12,500.96 = 8,772.80/x
3. Step 3: Cross multiply
   9,012.56x = 12,500.96 × 8,772.80
4. Step 4: Simplify right side
   9,012.56x = 109,668,421.89
5. Step 5: Solve for x
   x = 109,668,421.89/9,012.56
6. Step 6: Final answer
   x = 12,168.40