Finding the Fourth Proportional to 71.45, 106.50 and 65.98

Step by Step Solution

1. Step 1: Write the proportion equation
   71.45 : 106.50 = 65.98 : x
2. Step 2: Convert to fraction form
   71.45/106.50 = 65.98/x
3. Step 3: Cross multiply
   71.45x = 106.50 × 65.98
4. Step 4: Simplify right side
   71.45x = 7,026.88
5. Step 5: Solve for x
   x = 7,026.88/71.45
6. Step 6: Final answer
   x = 98.35