Finding the Fourth Proportional to 72.55, 108.83 and 42.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72.55 : 108.83 = 42.10 : x
2. Step 2: Convert to fraction form
   72.55/108.83 = 42.10/x
3. Step 3: Cross multiply
   72.55x = 108.83 × 42.10
4. Step 4: Simplify right side
   72.55x = 4,581.74
5. Step 5: Solve for x
   x = 4,581.74/72.55
6. Step 6: Final answer
   x = 63.15