Finding the Fourth Proportional to 72.06, 107.82 and 71.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72.06 : 107.82 = 71.88 : x
2. Step 2: Convert to fraction form
   72.06/107.82 = 71.88/x
3. Step 3: Cross multiply
   72.06x = 107.82 × 71.88
4. Step 4: Simplify right side
   72.06x = 7,750.10
5. Step 5: Solve for x
   x = 7,750.10/72.06
6. Step 6: Final answer
   x = 107.55