Finding the Fourth Proportional to 13,405.42, 18,496.78 and 8,100.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.42 : 18,496.78 = 8,100.53 : x
2. Step 2: Convert to fraction form
   13,405.42/18,496.78 = 8,100.53/x
3. Step 3: Cross multiply
   13,405.42x = 18,496.78 × 8,100.53
4. Step 4: Simplify right side
   13,405.42x = 149,833,721.29
5. Step 5: Solve for x
   x = 149,833,721.29/13,405.42
6. Step 6: Final answer
   x = 11,177.10