Finding the Fourth Proportional to 13,485.85, 18,610.55 and 7,517.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,485.85 : 18,610.55 = 7,517.47 : x
2. Step 2: Convert to fraction form
   13,485.85/18,610.55 = 7,517.47/x
3. Step 3: Cross multiply
   13,485.85x = 18,610.55 × 7,517.47
4. Step 4: Simplify right side
   13,485.85x = 139,904,213.72
5. Step 5: Solve for x
   x = 139,904,213.72/13,485.85
6. Step 6: Final answer
   x = 10,374.15