Finding the Fourth Proportional to 82.62, 123.88 and 42.07

Step by Step Solution

1. Step 1: Write the proportion equation
   82.62 : 123.88 = 42.07 : x
2. Step 2: Convert to fraction form
   82.62/123.88 = 42.07/x
3. Step 3: Cross multiply
   82.62x = 123.88 × 42.07
4. Step 4: Simplify right side
   82.62x = 5,211.63
5. Step 5: Solve for x
   x = 5,211.63/82.62
6. Step 6: Final answer
   x = 63.08