Finding the Fourth Proportional to 105.32, 145.31 and 103.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105.32 : 145.31 = 103.50 : x
2. Step 2: Convert to fraction form
   105.32/145.31 = 103.50/x
3. Step 3: Cross multiply
   105.32x = 145.31 × 103.50
4. Step 4: Simplify right side
   105.32x = 15,039.65
5. Step 5: Solve for x
   x = 15,039.65/105.32
6. Step 6: Final answer
   x = 142.80