Finding the Fourth Proportional to 82.70, 123.96 and 42.03

Step by Step Solution

1. Step 1: Write the proportion equation
   82.70 : 123.96 = 42.03 : x
2. Step 2: Convert to fraction form
   82.70/123.96 = 42.03/x
3. Step 3: Cross multiply
   82.70x = 123.96 × 42.03
4. Step 4: Simplify right side
   82.70x = 5,210.04
5. Step 5: Solve for x
   x = 5,210.04/82.70
6. Step 6: Final answer
   x = 63.00