Finding the Fourth Proportional to 72.84, 109.06 and 57.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.84 : 109.06 = 57.72 : x
2. Step 2: Convert to fraction form
   72.84/109.06 = 57.72/x
3. Step 3: Cross multiply
   72.84x = 109.06 × 57.72
4. Step 4: Simplify right side
   72.84x = 6,294.94
5. Step 5: Solve for x
   x = 6,294.94/72.84
6. Step 6: Final answer
   x = 86.42