Finding the Fourth Proportional to 78.10, 107.94 and 74.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78.10 : 107.94 = 74.83 : x
2. Step 2: Convert to fraction form
   78.10/107.94 = 74.83/x
3. Step 3: Cross multiply
   78.10x = 107.94 × 74.83
4. Step 4: Simplify right side
   78.10x = 8,077.15
5. Step 5: Solve for x
   x = 8,077.15/78.10
6. Step 6: Final answer
   x = 103.42