Finding the Fourth Proportional to 72.52, 100.15 and 49.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.52 : 100.15 = 49.31 : x
2. Step 2: Convert to fraction form
   72.52/100.15 = 49.31/x
3. Step 3: Cross multiply
   72.52x = 100.15 × 49.31
4. Step 4: Simplify right side
   72.52x = 4,938.40
5. Step 5: Solve for x
   x = 4,938.40/72.52
6. Step 6: Final answer
   x = 68.10