Finding the Fourth Proportional to 12,485.56, 17,234.94 and 7,706.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.56 : 17,234.94 = 7,706.20 : x
2. Step 2: Convert to fraction form
   12,485.56/17,234.94 = 7,706.20/x
3. Step 3: Cross multiply
   12,485.56x = 17,234.94 × 7,706.20
4. Step 4: Simplify right side
   12,485.56x = 132,815,894.63
5. Step 5: Solve for x
   x = 132,815,894.63/12,485.56
6. Step 6: Final answer
   x = 10,637.56