Finding the Fourth Proportional to 71.22, 106.72 and 56.03

Step by Step Solution

1. Step 1: Write the proportion equation
   71.22 : 106.72 = 56.03 : x
2. Step 2: Convert to fraction form
   71.22/106.72 = 56.03/x
3. Step 3: Cross multiply
   71.22x = 106.72 × 56.03
4. Step 4: Simplify right side
   71.22x = 5,979.76
5. Step 5: Solve for x
   x = 5,979.76/71.22
6. Step 6: Final answer
   x = 83.96