Finding the Fourth Proportional to 78.83, 108.73 and 51.17

Step by Step Solution

1. Step 1: Write the proportion equation
   78.83 : 108.73 = 51.17 : x
2. Step 2: Convert to fraction form
   78.83/108.73 = 51.17/x
3. Step 3: Cross multiply
   78.83x = 108.73 × 51.17
4. Step 4: Simplify right side
   78.83x = 5,563.71
5. Step 5: Solve for x
   x = 5,563.71/78.83
6. Step 6: Final answer
   x = 70.58