Finding the Fourth Proportional to 12,729.06, 17,566.89 and 8,472.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,729.06 : 17,566.89 = 8,472.78 : x
2. Step 2: Convert to fraction form
   12,729.06/17,566.89 = 8,472.78/x
3. Step 3: Cross multiply
   12,729.06x = 17,566.89 × 8,472.78
4. Step 4: Simplify right side
   12,729.06x = 148,840,394.25
5. Step 5: Solve for x
   x = 148,840,394.25/12,729.06
6. Step 6: Final answer
   x = 11,692.96