Finding the Fourth Proportional to 71.19, 106.56 and 53.10

Step by Step Solution

1. Step 1: Write the proportion equation
   71.19 : 106.56 = 53.10 : x
2. Step 2: Convert to fraction form
   71.19/106.56 = 53.10/x
3. Step 3: Cross multiply
   71.19x = 106.56 × 53.10
4. Step 4: Simplify right side
   71.19x = 5,658.34
5. Step 5: Solve for x
   x = 5,658.34/71.19
6. Step 6: Final answer
   x = 79.48