Finding the Fourth Proportional to 83.72, 125.34 and 56.54

Step by Step Solution

1. Step 1: Write the proportion equation
   83.72 : 125.34 = 56.54 : x
2. Step 2: Convert to fraction form
   83.72/125.34 = 56.54/x
3. Step 3: Cross multiply
   83.72x = 125.34 × 56.54
4. Step 4: Simplify right side
   83.72x = 7,086.72
5. Step 5: Solve for x
   x = 7,086.72/83.72
6. Step 6: Final answer
   x = 84.65