Finding the Fourth Proportional to 78.22, 116.83 and 61.06

Step by Step Solution

1. Step 1: Write the proportion equation
   78.22 : 116.83 = 61.06 : x
2. Step 2: Convert to fraction form
   78.22/116.83 = 61.06/x
3. Step 3: Cross multiply
   78.22x = 116.83 × 61.06
4. Step 4: Simplify right side
   78.22x = 7,133.64
5. Step 5: Solve for x
   x = 7,133.64/78.22
6. Step 6: Final answer
   x = 91.20