Finding the Fourth Proportional to 8,200.80, 12,306.06 and 7,681.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,200.80 : 12,306.06 = 7,681.89 : x
2. Step 2: Convert to fraction form
   8,200.80/12,306.06 = 7,681.89/x
3. Step 3: Cross multiply
   8,200.80x = 12,306.06 × 7,681.89
4. Step 4: Simplify right side
   8,200.80x = 94,533,799.25
5. Step 5: Solve for x
   x = 94,533,799.25/8,200.80
6. Step 6: Final answer
   x = 11,527.39