Finding the Fourth Proportional to 78.01, 107.63 and 51.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78.01 : 107.63 = 51.83 : x
2. Step 2: Convert to fraction form
   78.01/107.63 = 51.83/x
3. Step 3: Cross multiply
   78.01x = 107.63 × 51.83
4. Step 4: Simplify right side
   78.01x = 5,578.67
5. Step 5: Solve for x
   x = 5,578.67/78.01
6. Step 6: Final answer
   x = 71.51