Finding the Fourth Proportional to 13,485.72, 18,610.32 and 7,436.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,485.72 : 18,610.32 = 7,436.64 : x
2. Step 2: Convert to fraction form
   13,485.72/18,610.32 = 7,436.64/x
3. Step 3: Cross multiply
   13,485.72x = 18,610.32 × 7,436.64
4. Step 4: Simplify right side
   13,485.72x = 138,398,250.12
5. Step 5: Solve for x
   x = 138,398,250.12/13,485.72
6. Step 6: Final answer
   x = 10,262.58