Finding the Fourth Proportional to 86.88, 130.22 and 83.48

Step by Step Solution

1. Step 1: Write the proportion equation
   86.88 : 130.22 = 83.48 : x
2. Step 2: Convert to fraction form
   86.88/130.22 = 83.48/x
3. Step 3: Cross multiply
   86.88x = 130.22 × 83.48
4. Step 4: Simplify right side
   86.88x = 10,870.77
5. Step 5: Solve for x
   x = 10,870.77/86.88
6. Step 6: Final answer
   x = 125.12