Finding the Fourth Proportional to 72.51, 108.76 and 42.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72.51 : 108.76 = 42.05 : x
2. Step 2: Convert to fraction form
   72.51/108.76 = 42.05/x
3. Step 3: Cross multiply
   72.51x = 108.76 × 42.05
4. Step 4: Simplify right side
   72.51x = 4,573.52
5. Step 5: Solve for x
   x = 4,573.52/72.51
6. Step 6: Final answer
   x = 63.08