Finding the Fourth Proportional to 72.82, 109.18 and 47.13

Step by Step Solution

1. Step 1: Write the proportion equation
   72.82 : 109.18 = 47.13 : x
2. Step 2: Convert to fraction form
   72.82/109.18 = 47.13/x
3. Step 3: Cross multiply
   72.82x = 109.18 × 47.13
4. Step 4: Simplify right side
   72.82x = 5,145.65
5. Step 5: Solve for x
   x = 5,145.65/72.82
6. Step 6: Final answer
   x = 70.66