Finding the Fourth Proportional to 62.82, 86.63 and 42.05

Step by Step Solution

1. Step 1: Write the proportion equation
   62.82 : 86.63 = 42.05 : x
2. Step 2: Convert to fraction form
   62.82/86.63 = 42.05/x
3. Step 3: Cross multiply
   62.82x = 86.63 × 42.05
4. Step 4: Simplify right side
   62.82x = 3,642.15
5. Step 5: Solve for x
   x = 3,642.15/62.82
6. Step 6: Final answer
   x = 57.98