Finding the Fourth Proportional to 83.76, 125.67 and 43.21

Step by Step Solution

1. Step 1: Write the proportion equation
   83.76 : 125.67 = 43.21 : x
2. Step 2: Convert to fraction form
   83.76/125.67 = 43.21/x
3. Step 3: Cross multiply
   83.76x = 125.67 × 43.21
4. Step 4: Simplify right side
   83.76x = 5,429.89
5. Step 5: Solve for x
   x = 5,429.89/83.76
6. Step 6: Final answer
   x = 64.83