Finding the Fourth Proportional to 71.15, 106.46 and 53.98

Step by Step Solution

1. Step 1: Write the proportion equation
   71.15 : 106.46 = 53.98 : x
2. Step 2: Convert to fraction form
   71.15/106.46 = 53.98/x
3. Step 3: Cross multiply
   71.15x = 106.46 × 53.98
4. Step 4: Simplify right side
   71.15x = 5,746.17
5. Step 5: Solve for x
   x = 5,746.17/71.15
6. Step 6: Final answer
   x = 80.76