Finding the Fourth Proportional to 82.92, 123.72 and 69.40

Step by Step Solution

1. Step 1: Write the proportion equation
   82.92 : 123.72 = 69.40 : x
2. Step 2: Convert to fraction form
   82.92/123.72 = 69.40/x
3. Step 3: Cross multiply
   82.92x = 123.72 × 69.40
4. Step 4: Simplify right side
   82.92x = 8,586.17
5. Step 5: Solve for x
   x = 8,586.17/82.92
6. Step 6: Final answer
   x = 103.55