Finding the Fourth Proportional to 72.63, 109.17 and 71.46

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 109.17 = 71.46 : x
2. Step 2: Convert to fraction form
   72.63/109.17 = 71.46/x
3. Step 3: Cross multiply
   72.63x = 109.17 × 71.46
4. Step 4: Simplify right side
   72.63x = 7,801.29
5. Step 5: Solve for x
   x = 7,801.29/72.63
6. Step 6: Final answer
   x = 107.41