Finding the Fourth Proportional to 13,444.16, 18,546.72 and 8,405.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,444.16 : 18,546.72 = 8,405.12 : x
2. Step 2: Convert to fraction form
   13,444.16/18,546.72 = 8,405.12/x
3. Step 3: Cross multiply
   13,444.16x = 18,546.72 × 8,405.12
4. Step 4: Simplify right side
   13,444.16x = 155,887,407.21
5. Step 5: Solve for x
   x = 155,887,407.21/13,444.16
6. Step 6: Final answer
   x = 11,595.18