Finding the Fourth Proportional to 82.61, 123.93 and 28.50

Step by Step Solution

1. Step 1: Write the proportion equation
   82.61 : 123.93 = 28.50 : x
2. Step 2: Convert to fraction form
   82.61/123.93 = 28.50/x
3. Step 3: Cross multiply
   82.61x = 123.93 × 28.50
4. Step 4: Simplify right side
   82.61x = 3,532.01
5. Step 5: Solve for x
   x = 3,532.01/82.61
6. Step 6: Final answer
   x = 42.76