Finding the Fourth Proportional to 72.91, 100.56 and 52.18

Step by Step Solution

1. Step 1: Write the proportion equation
   72.91 : 100.56 = 52.18 : x
2. Step 2: Convert to fraction form
   72.91/100.56 = 52.18/x
3. Step 3: Cross multiply
   72.91x = 100.56 × 52.18
4. Step 4: Simplify right side
   72.91x = 5,247.22
5. Step 5: Solve for x
   x = 5,247.22/72.91
6. Step 6: Final answer
   x = 71.97