Finding the Fourth Proportional to 28.74, 42.89 and 28.00

Step by Step Solution

1. Step 1: Write the proportion equation
   28.74 : 42.89 = 28.00 : x
2. Step 2: Convert to fraction form
   28.74/42.89 = 28.00/x
3. Step 3: Cross multiply
   28.74x = 42.89 × 28.00
4. Step 4: Simplify right side
   28.74x = 1,200.88
5. Step 5: Solve for x
   x = 1,200.88/28.74
6. Step 6: Final answer
   x = 41.78