Finding the Fourth Proportional to 83.52, 115.43 and 72.72

Step by Step Solution

1. Step 1: Write the proportion equation
   83.52 : 115.43 = 72.72 : x
2. Step 2: Convert to fraction form
   83.52/115.43 = 72.72/x
3. Step 3: Cross multiply
   83.52x = 115.43 × 72.72
4. Step 4: Simplify right side
   83.52x = 8,393.71
5. Step 5: Solve for x
   x = 8,393.71/83.52
6. Step 6: Final answer
   x = 100.50