Finding the Fourth Proportional to 72.99, 100.68 and 52.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 100.68 = 52.31 : x
2. Step 2: Convert to fraction form
   72.99/100.68 = 52.31/x
3. Step 3: Cross multiply
   72.99x = 100.68 × 52.31
4. Step 4: Simplify right side
   72.99x = 5,266.07
5. Step 5: Solve for x
   x = 5,266.07/72.99
6. Step 6: Final answer
   x = 72.15