Finding the Fourth Proportional to 72.72, 109.04 and 31.58

Step by Step Solution

1. Step 1: Write the proportion equation
   72.72 : 109.04 = 31.58 : x
2. Step 2: Convert to fraction form
   72.72/109.04 = 31.58/x
3. Step 3: Cross multiply
   72.72x = 109.04 × 31.58
4. Step 4: Simplify right side
   72.72x = 3,443.02
5. Step 5: Solve for x
   x = 3,443.02/72.72
6. Step 6: Final answer
   x = 47.35