Finding the Fourth Proportional to 9,512.13, 13,127.72 and 5,479.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,512.13 : 13,127.72 = 5,479.09 : x
2. Step 2: Convert to fraction form
   9,512.13/13,127.72 = 5,479.09/x
3. Step 3: Cross multiply
   9,512.13x = 13,127.72 × 5,479.09
4. Step 4: Simplify right side
   9,512.13x = 71,927,959.37
5. Step 5: Solve for x
   x = 71,927,959.37/9,512.13
6. Step 6: Final answer
   x = 7,561.71