Finding the Fourth Proportional to 72.63, 100.23 and 54.17

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 100.23 = 54.17 : x
2. Step 2: Convert to fraction form
   72.63/100.23 = 54.17/x
3. Step 3: Cross multiply
   72.63x = 100.23 × 54.17
4. Step 4: Simplify right side
   72.63x = 5,429.46
5. Step 5: Solve for x
   x = 5,429.46/72.63
6. Step 6: Final answer
   x = 74.76