Finding the Fourth Proportional to 82.60, 123.96 and 42.08

Step by Step Solution

1. Step 1: Write the proportion equation
   82.60 : 123.96 = 42.08 : x
2. Step 2: Convert to fraction form
   82.60/123.96 = 42.08/x
3. Step 3: Cross multiply
   82.60x = 123.96 × 42.08
4. Step 4: Simplify right side
   82.60x = 5,216.24
5. Step 5: Solve for x
   x = 5,216.24/82.60
6. Step 6: Final answer
   x = 63.15