Finding the Fourth Proportional to 83.50, 115.53 and 71.83

Step by Step Solution

1. Step 1: Write the proportion equation
   83.50 : 115.53 = 71.83 : x
2. Step 2: Convert to fraction form
   83.50/115.53 = 71.83/x
3. Step 3: Cross multiply
   83.50x = 115.53 × 71.83
4. Step 4: Simplify right side
   83.50x = 8,298.52
5. Step 5: Solve for x
   x = 8,298.52/83.50
6. Step 6: Final answer
   x = 99.38