Finding the Fourth Proportional to 13,406.67, 18,498.51 and 8,101.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.67 : 18,498.51 = 8,101.78 : x
2. Step 2: Convert to fraction form
   13,406.67/18,498.51 = 8,101.78/x
3. Step 3: Cross multiply
   13,406.67x = 18,498.51 × 8,101.78
4. Step 4: Simplify right side
   13,406.67x = 149,870,812.10
5. Step 5: Solve for x
   x = 149,870,812.10/13,406.67
6. Step 6: Final answer
   x = 11,178.82