Finding the Fourth Proportional to 72.63, 109.71 and 72.63

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 109.71 = 72.63 : x
2. Step 2: Convert to fraction form
   72.63/109.71 = 72.63/x
3. Step 3: Cross multiply
   72.63x = 109.71 × 72.63
4. Step 4: Simplify right side
   72.63x = 7,968.24
5. Step 5: Solve for x
   x = 7,968.24/72.63
6. Step 6: Final answer
   x = 109.71