Finding the Fourth Proportional to 72.84, 100.55 and 51.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72.84 : 100.55 = 51.02 : x
2. Step 2: Convert to fraction form
   72.84/100.55 = 51.02/x
3. Step 3: Cross multiply
   72.84x = 100.55 × 51.02
4. Step 4: Simplify right side
   72.84x = 5,130.06
5. Step 5: Solve for x
   x = 5,130.06/72.84
6. Step 6: Final answer
   x = 70.43