Finding the Fourth Proportional to 13,443.60, 18,548.28 and 9,191.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,443.60 : 18,548.28 = 9,191.10 : x
2. Step 2: Convert to fraction form
   13,443.60/18,548.28 = 9,191.10/x
3. Step 3: Cross multiply
   13,443.60x = 18,548.28 × 9,191.10
4. Step 4: Simplify right side
   13,443.60x = 170,479,096.31
5. Step 5: Solve for x
   x = 170,479,096.31/13,443.60
6. Step 6: Final answer
   x = 12,681.06