Finding the Fourth Proportional to 72.95, 108.72 and 70.92

Step by Step Solution

1. Step 1: Write the proportion equation
   72.95 : 108.72 = 70.92 : x
2. Step 2: Convert to fraction form
   72.95/108.72 = 70.92/x
3. Step 3: Cross multiply
   72.95x = 108.72 × 70.92
4. Step 4: Simplify right side
   72.95x = 7,710.42
5. Step 5: Solve for x
   x = 7,710.42/72.95
6. Step 6: Final answer
   x = 105.70