Finding the Fourth Proportional to 83.18, 114.72 and 72.14

Step by Step Solution

1. Step 1: Write the proportion equation
   83.18 : 114.72 = 72.14 : x
2. Step 2: Convert to fraction form
   83.18/114.72 = 72.14/x
3. Step 3: Cross multiply
   83.18x = 114.72 × 72.14
4. Step 4: Simplify right side
   83.18x = 8,275.90
5. Step 5: Solve for x
   x = 8,275.90/83.18
6. Step 6: Final answer
   x = 99.49