Finding the Fourth Proportional to 28.02, 42.01 and 12.00

Step by Step Solution

1. Step 1: Write the proportion equation
   28.02 : 42.01 = 12.00 : x
2. Step 2: Convert to fraction form
   28.02/42.01 = 12.00/x
3. Step 3: Cross multiply
   28.02x = 42.01 × 12.00
4. Step 4: Simplify right side
   28.02x = 503.88
5. Step 5: Solve for x
   x = 503.88/28.02
6. Step 6: Final answer
   x = 17.98