Finding the Fourth Proportional to 28,448.42, 42,651.50 and 13,643.24

Step by Step Solution

1. Step 1: Write the proportion equation
   28,448.42 : 42,651.50 = 13,643.24 : x
2. Step 2: Convert to fraction form
   28,448.42/42,651.50 = 13,643.24/x
3. Step 3: Cross multiply
   28,448.42x = 42,651.50 × 13,643.24
4. Step 4: Simplify right side
   28,448.42x = 581,904,369.39
5. Step 5: Solve for x
   x = 581,904,369.39/28,448.42
6. Step 6: Final answer
   x = 20,454.72