Finding the Fourth Proportional to 72.10, 107.56 and 65.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.10 : 107.56 = 65.98 : x
2. Step 2: Convert to fraction form
   72.10/107.56 = 65.98/x
3. Step 3: Cross multiply
   72.10x = 107.56 × 65.98
4. Step 4: Simplify right side
   72.10x = 7,096.81
5. Step 5: Solve for x
   x = 7,096.81/72.10
6. Step 6: Final answer
   x = 98.43