Finding the Fourth Proportional to 72.77, 100.54 and 70.17

Step by Step Solution

1. Step 1: Write the proportion equation
   72.77 : 100.54 = 70.17 : x
2. Step 2: Convert to fraction form
   72.77/100.54 = 70.17/x
3. Step 3: Cross multiply
   72.77x = 100.54 × 70.17
4. Step 4: Simplify right side
   72.77x = 7,054.89
5. Step 5: Solve for x
   x = 7,054.89/72.77
6. Step 6: Final answer
   x = 96.95