Finding the Fourth Proportional to 16,499.20, 23,129.60 and 16,499.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,499.20 : 23,129.60 = 16,499.20 : x
2. Step 2: Convert to fraction form
   16,499.20/23,129.60 = 16,499.20/x
3. Step 3: Cross multiply
   16,499.20x = 23,129.60 × 16,499.20
4. Step 4: Simplify right side
   16,499.20x = 381,619,896.32
5. Step 5: Solve for x
   x = 381,619,896.32/16,499.20
6. Step 6: Final answer
   x = 23,129.60