Finding the Fourth Proportional to 72.63, 109.01 and 40.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 109.01 = 40.15 : x
2. Step 2: Convert to fraction form
   72.63/109.01 = 40.15/x
3. Step 3: Cross multiply
   72.63x = 109.01 × 40.15
4. Step 4: Simplify right side
   72.63x = 4,376.75
5. Step 5: Solve for x
   x = 4,376.75/72.63
6. Step 6: Final answer
   x = 60.26