Finding the Fourth Proportional to 13,395.06, 18,485.10 and 7,729.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,395.06 : 18,485.10 = 7,729.74 : x
2. Step 2: Convert to fraction form
   13,395.06/18,485.10 = 7,729.74/x
3. Step 3: Cross multiply
   13,395.06x = 18,485.10 × 7,729.74
4. Step 4: Simplify right side
   13,395.06x = 142,885,016.87
5. Step 5: Solve for x
   x = 142,885,016.87/13,395.06
6. Step 6: Final answer
   x = 10,666.99