Finding the Fourth Proportional to 82.22, 123.08 and 57.78

Step by Step Solution

1. Step 1: Write the proportion equation
   82.22 : 123.08 = 57.78 : x
2. Step 2: Convert to fraction form
   82.22/123.08 = 57.78/x
3. Step 3: Cross multiply
   82.22x = 123.08 × 57.78
4. Step 4: Simplify right side
   82.22x = 7,111.56
5. Step 5: Solve for x
   x = 7,111.56/82.22
6. Step 6: Final answer
   x = 86.49