Finding the Fourth Proportional to 82.13, 123.18 and 28.01

Step by Step Solution

1. Step 1: Write the proportion equation
   82.13 : 123.18 = 28.01 : x
2. Step 2: Convert to fraction form
   82.13/123.18 = 28.01/x
3. Step 3: Cross multiply
   82.13x = 123.18 × 28.01
4. Step 4: Simplify right side
   82.13x = 3,449.55
5. Step 5: Solve for x
   x = 3,449.55/82.13
6. Step 6: Final answer
   x = 42.00