Finding the Fourth Proportional to 83.43, 115.02 and 72.50

Step by Step Solution

1. Step 1: Write the proportion equation
   83.43 : 115.02 = 72.50 : x
2. Step 2: Convert to fraction form
   83.43/115.02 = 72.50/x
3. Step 3: Cross multiply
   83.43x = 115.02 × 72.50
4. Step 4: Simplify right side
   83.43x = 8,338.37
5. Step 5: Solve for x
   x = 8,338.37/83.43
6. Step 6: Final answer
   x = 99.94