Finding the Fourth Proportional to 72.99, 100.72 and 41.90

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 100.72 = 41.90 : x
2. Step 2: Convert to fraction form
   72.99/100.72 = 41.90/x
3. Step 3: Cross multiply
   72.99x = 100.72 × 41.90
4. Step 4: Simplify right side
   72.99x = 4,219.45
5. Step 5: Solve for x
   x = 4,219.45/72.99
6. Step 6: Final answer
   x = 57.81