Finding the Fourth Proportional to 72.84, 100.50 and 71.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72.84 : 100.50 = 71.88 : x
2. Step 2: Convert to fraction form
   72.84/100.50 = 71.88/x
3. Step 3: Cross multiply
   72.84x = 100.50 × 71.88
4. Step 4: Simplify right side
   72.84x = 7,223.94
5. Step 5: Solve for x
   x = 7,223.94/72.84
6. Step 6: Final answer
   x = 99.18