Finding the Fourth Proportional to 78.06, 116.51 and 69.05

Step by Step Solution

1. Step 1: Write the proportion equation
   78.06 : 116.51 = 69.05 : x
2. Step 2: Convert to fraction form
   78.06/116.51 = 69.05/x
3. Step 3: Cross multiply
   78.06x = 116.51 × 69.05
4. Step 4: Simplify right side
   78.06x = 8,045.54
5. Step 5: Solve for x
   x = 8,045.54/78.06
6. Step 6: Final answer
   x = 103.06