Finding the Fourth Proportional to 86.94, 130.61 and 83.50

Step by Step Solution

1. Step 1: Write the proportion equation
   86.94 : 130.61 = 83.50 : x
2. Step 2: Convert to fraction form
   86.94/130.61 = 83.50/x
3. Step 3: Cross multiply
   86.94x = 130.61 × 83.50
4. Step 4: Simplify right side
   86.94x = 10,905.82
5. Step 5: Solve for x
   x = 10,905.82/86.94
6. Step 6: Final answer
   x = 125.44