Finding the Fourth Proportional to 13,456.89, 18,566.28 and 9,480.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,456.89 : 18,566.28 = 9,480.20 : x
2. Step 2: Convert to fraction form
   13,456.89/18,566.28 = 9,480.20/x
3. Step 3: Cross multiply
   13,456.89x = 18,566.28 × 9,480.20
4. Step 4: Simplify right side
   13,456.89x = 176,011,954.82
5. Step 5: Solve for x
   x = 176,011,954.82/13,456.89
6. Step 6: Final answer
   x = 13,079.69