Finding the Fourth Proportional to 13,870.42, 19,139.67 and 8,205.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.42 : 19,139.67 = 8,205.37 : x
2. Step 2: Convert to fraction form
   13,870.42/19,139.67 = 8,205.37/x
3. Step 3: Cross multiply
   13,870.42x = 19,139.67 × 8,205.37
4. Step 4: Simplify right side
   13,870.42x = 157,048,074.03
5. Step 5: Solve for x
   x = 157,048,074.03/13,870.42
6. Step 6: Final answer
   x = 11,322.52