Finding the Fourth Proportional to 13,870.16, 19,139.33 and 8,205.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.16 : 19,139.33 = 8,205.12 : x
2. Step 2: Convert to fraction form
   13,870.16/19,139.33 = 8,205.12/x
3. Step 3: Cross multiply
   13,870.16x = 19,139.33 × 8,205.12
4. Step 4: Simplify right side
   13,870.16x = 157,040,458.34
5. Step 5: Solve for x
   x = 157,040,458.34/13,870.16
6. Step 6: Final answer
   x = 11,322.18