Finding the Fourth Proportional to 82.22, 123.51 and 78.26

Step by Step Solution

1. Step 1: Write the proportion equation
   82.22 : 123.51 = 78.26 : x
2. Step 2: Convert to fraction form
   82.22/123.51 = 78.26/x
3. Step 3: Cross multiply
   82.22x = 123.51 × 78.26
4. Step 4: Simplify right side
   82.22x = 9,665.89
5. Step 5: Solve for x
   x = 9,665.89/82.22
6. Step 6: Final answer
   x = 117.56