Finding the Fourth Proportional to 28,680.96, 42,995.52 and 10,200

Step by Step Solution

1. Step 1: Write the proportion equation
   28,680.96 : 42,995.52 = 10,200 : x
2. Step 2: Convert to fraction form
   28,680.96/42,995.52 = 10,200/x
3. Step 3: Cross multiply
   28,680.96x = 42,995.52 × 10,200
4. Step 4: Simplify right side
   28,680.96x = 438,554,304.00
5. Step 5: Solve for x
   x = 438,554,304.00/28,680.96
6. Step 6: Final answer
   x = 15,290.78