Finding the Fourth Proportional to 16,111.60, 24,138.60 and 13,807.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,111.60 : 24,138.60 = 13,807.60 : x
2. Step 2: Convert to fraction form
   16,111.60/24,138.60 = 13,807.60/x
3. Step 3: Cross multiply
   16,111.60x = 24,138.60 × 13,807.60
4. Step 4: Simplify right side
   16,111.60x = 333,296,133.36
5. Step 5: Solve for x
   x = 333,296,133.36/16,111.60
6. Step 6: Final answer
   x = 20,686.72