Finding the Fourth Proportional to 13,485.89, 18,609.35 and 7,517.45

Step by Step Solution

1. Step 1: Write the proportion equation
   13,485.89 : 18,609.35 = 7,517.45 : x
2. Step 2: Convert to fraction form
   13,485.89/18,609.35 = 7,517.45/x
3. Step 3: Cross multiply
   13,485.89x = 18,609.35 × 7,517.45
4. Step 4: Simplify right side
   13,485.89x = 139,894,867.09
5. Step 5: Solve for x
   x = 139,894,867.09/13,485.89
6. Step 6: Final answer
   x = 10,373.42