Finding the Fourth Proportional to 10,216.04, 15,393.56 and 8,407.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,216.04 : 15,393.56 = 8,407.72 : x
2. Step 2: Convert to fraction form
   10,216.04/15,393.56 = 8,407.72/x
3. Step 3: Cross multiply
   10,216.04x = 15,393.56 × 8,407.72
4. Step 4: Simplify right side
   10,216.04x = 129,424,742.28
5. Step 5: Solve for x
   x = 129,424,742.28/10,216.04
6. Step 6: Final answer
   x = 12,668.78