Finding the Fourth Proportional to 83.69, 115.51 and 48.72

Step by Step Solution

1. Step 1: Write the proportion equation
   83.69 : 115.51 = 48.72 : x
2. Step 2: Convert to fraction form
   83.69/115.51 = 48.72/x
3. Step 3: Cross multiply
   83.69x = 115.51 × 48.72
4. Step 4: Simplify right side
   83.69x = 5,627.81
5. Step 5: Solve for x
   x = 5,627.81/83.69
6. Step 6: Final answer
   x = 67.25