Finding the Fourth Proportional to 13,407.67, 18,499.89 and 8,102.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,407.67 : 18,499.89 = 8,102.78 : x
2. Step 2: Convert to fraction form
   13,407.67/18,499.89 = 8,102.78/x
3. Step 3: Cross multiply
   13,407.67x = 18,499.89 × 8,102.78
4. Step 4: Simplify right side
   13,407.67x = 149,900,538.69
5. Step 5: Solve for x
   x = 149,900,538.69/13,407.67
6. Step 6: Final answer
   x = 11,180.21