Finding the Fourth Proportional to 28,643.58, 42,964.72 and 16,872.03

Step by Step Solution

1. Step 1: Write the proportion equation
   28,643.58 : 42,964.72 = 16,872.03 : x
2. Step 2: Convert to fraction form
   28,643.58/42,964.72 = 16,872.03/x
3. Step 3: Cross multiply
   28,643.58x = 42,964.72 × 16,872.03
4. Step 4: Simplify right side
   28,643.58x = 724,902,044.78
5. Step 5: Solve for x
   x = 724,902,044.78/28,643.58
6. Step 6: Final answer
   x = 25,307.66