Finding the Fourth Proportional to 62.86, 86.75 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   62.86 : 86.75 = 42.10 : x
2. Step 2: Convert to fraction form
   62.86/86.75 = 42.10/x
3. Step 3: Cross multiply
   62.86x = 86.75 × 42.10
4. Step 4: Simplify right side
   62.86x = 3,652.28
5. Step 5: Solve for x
   x = 3,652.28/62.86
6. Step 6: Final answer
   x = 58.10