Finding the Fourth Proportional to 105.60, 145.62 and 74.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105.60 : 145.62 = 74.50 : x
2. Step 2: Convert to fraction form
   105.60/145.62 = 74.50/x
3. Step 3: Cross multiply
   105.60x = 145.62 × 74.50
4. Step 4: Simplify right side
   105.60x = 10,848.69
5. Step 5: Solve for x
   x = 10,848.69/105.60
6. Step 6: Final answer
   x = 102.73