Finding the Fourth Proportional to 71.01, 106.43 and 53.78

Step by Step Solution

1. Step 1: Write the proportion equation
   71.01 : 106.43 = 53.78 : x
2. Step 2: Convert to fraction form
   71.01/106.43 = 53.78/x
3. Step 3: Cross multiply
   71.01x = 106.43 × 53.78
4. Step 4: Simplify right side
   71.01x = 5,723.00
5. Step 5: Solve for x
   x = 5,723.00/71.01
6. Step 6: Final answer
   x = 80.59