Finding the Fourth Proportional to 12,445.78, 17,174.55 and 7,729.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,445.78 : 17,174.55 = 7,729.96 : x
2. Step 2: Convert to fraction form
   12,445.78/17,174.55 = 7,729.96/x
3. Step 3: Cross multiply
   12,445.78x = 17,174.55 × 7,729.96
4. Step 4: Simplify right side
   12,445.78x = 132,758,584.52
5. Step 5: Solve for x
   x = 132,758,584.52/12,445.78
6. Step 6: Final answer
   x = 10,666.96