Finding the Fourth Proportional to 16,436.16, 24,678.84 and 13,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   16,436.16 : 24,678.84 = 13,139.52 : x
2. Step 2: Convert to fraction form
   16,436.16/24,678.84 = 13,139.52/x
3. Step 3: Cross multiply
   16,436.16x = 24,678.84 × 13,139.52
4. Step 4: Simplify right side
   16,436.16x = 324,268,111.76
5. Step 5: Solve for x
   x = 324,268,111.76/16,436.16
6. Step 6: Final answer
   x = 19,728.95